KEW BULLETIN VOL. 65: 279–303 (2010)
New species of Dypsis and Ravenea (Arecaceae) from Madagascar
Mijoro Rakotoarinivo1 & John Dransfield2
Summary. Fourteen new species of palms (Arecaceae) from Madagascar are described and named, based on material
collected over the last 15 years. Twelve species belong to the genus Dypsis, namely D. andilamenensis Rakotoarin.
& J. Dransf., D. anjae Rakotoarin. & J. Dransf., D. betsimisarakae Rakotoarin. & J. Dransf., D. culminis Rakotoarin. &
J. Dransf., D. dracaenoides Rakotoarin. & J. Dransf., D. gautieri Rakotoarin. & J. Dransf., D. gronophyllum Rakotoarin.
& J. Dransf., D. jeremiei Rakotoarin. & J. Dransf., D. metallica Rakotoarin. & J. Dransf., D. reflexa Rakotoarin. & J. Dransf.,
D. sancta Rakotoarin. & J. Dransf. and D. vonitrandambo Rakotoarin. & J. Dransf. and two species belong to the genus
Ravenea: R. beentjei Rakotoarin. & J. Dransf. and R. hypoleuca Rakotoarin. & J. Dransf. Despite the fact that most of these
species have been recorded from protected areas that are difficult to access in the eastern region of Madagasacar, they
are all threatened. Based on IUCN categories and criteria, seven are Critically Endangered and seven are Vulnerable.
Key Words. Arecaceae, Dypsis, Madagascar, Palmae, Palms, Ravenea.
Introduction
Undescribed palms continue to be discovered in
Madagascar. Since the publication of The Palms of
Madagascar by Dransfield & Beentje (1995), several
species have been described either from the wild or
from cultivation (Dransfield & Marcus 2002; Dransfield
2003; Hodel & Marcus 2004; Britt & Dransfield 2005;
Rakotoarinivo et al. 2007; Dransfield et al. 2008;
Rakotoarinivo 2008; Rakotoarinivo et al. 2009). Beginning in 2006, we started an intensive study of the
distributions of palms within Madagascar. As part of a
palm diversity study that involved predictive modelling
of species distributions in selected areas in Madagascar, several localities were visited for the first time and
surveyed for palms. During this fieldwork new populations of rare species were recorded, as well as
species new to science. For example, in Vondrozo in
the southeast of Madagascar, the largest population
of the highly endangered endemic Beccariophoenix
madagascariensis on the island was discovered and Dypsis
tanalensis was rediscovered, a species that had not been
seen in the field since the type specimen was collected
in the early 1900s. In addition, four undescribed species
of palm were discovered.
Here we describe 12 new species of Dypsis and two of
Ravenea, which were collected across the eastern part of
Madagascar. With these novelties, Dypsis now includes
165 species and Ravenea 20, thus bringing the number
of palm species currently known from Madagascar to
188 indigenous species (the presumed introductions
Cocos nucifera L., Elaeis guineensis Jacq., Phoenix dactylifera
L. and Raphia farinifera (Gaertn.) Hyl. are excluded
from this total). Although the voucher specimens on
which some new species are based is not complete, we
argue that it is better at this stage to provide names as
reference points for future studies. Cataloguing of the
palms of Madagascar is still incomplete and as hitherto
inaccessible areas are surveyed, yet more additions to
this rich and fascinating flora will be made.
Although recorded from remote areas, difficult of
access, all these new palm species are threatened.
Less than 10% of the primary vegetation remains
intact in Madagascar (Moat & Smith 2007) and it is
estimated that a further 200,000 − 300,000 hectares of
forest are lost annually (Hanski et al. 2007). Consequently, many species are on the verge of extinction or
threatened by population fragmentation. For palms,
the latest conservation analysis shows that among the
172 species known in 2007, only 18 are not threatened
(Rakotoarinivo 2008). This same trend is revealed by
the 14 species described as new here. In accordance
with the IUCN Red List criteria (IUCN 2001) seven
species are Critically Endangered whereas the remaining seven are Vulnerable.
The species accounts provide information about
distribution, habitat type, notes on taxonomic affinity
and conservation status. The new species of Dypsis
appear in an order that corresponds with the informal infra-generic groups defined by Dransfield &
Beentje (1995).
Accepted for publication July 2010.
1
Royal Botanic Gardens, Kew, Madagascar Office, Lot II J 131 B, Ambodivoanjo Ivandry, Antananarivo 101, Madagascar. e-mail: mrakotoarinivo.
rbgkew@moov.mg
2
Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK. e-mail: j.dransfield@kew.org
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
280
Dypsis
1. Dypsis sancta Rakotoarin. & J. Dransf., sp. nov.
D. ovobontsirae Beentje versosimiliter affinis sed rachidi
folii recurvata inflorescentia minore rachillis plurimis
differt. Typus: Madagascar, Toamasina, Vavatenina,
Vatovelona, A. Byg 1 (holotypus K!; isotypus AAU!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105555-1
Slender solitary, erect palm. Stem to 10 m tall, 5 cm
diam. Leaves 6 – 8 in the crown, strongly arching,
pinnate; sheath 31 – 50 cm long, c. 2.5 cm wide, open
to c. 10 cm in the distal part, pale green, covered with
scattered blackish-red scales becoming more dense
distally, auricles 6 – 7 × 0.4 – 0.5 cm, ragged at the
margins; petiole 15 – 20 cm long, 3 – 5 cm wide,
adaxially flattened to deeply channelled, densely covered with blackish deciduous scales; rachis 75 – 90 cm
long, in mid-leaf 7 – 8 mm wide, strongly keeled, with
scattered scales; leaflets regularly arranged, 25 – 30 on
each side of the rachis, dark green, unequally attenuate,
proximal leaflets 9 – 13.5 × 0.7 – 2 cm, median leaflets
23 – 30 × 3.4 – 4.5 cm, distal leaflets 9 – 15 × 1.2 – 2.3 cm,
tip to 6 cm long, main veins 3 – 5, abaxial surface
glabrous. Inflorescence interfoliar, branched to 3 orders,
erect, 50 – 60 cm long, yellowish-green, with scattered
orange scales on the peduncle and the proximal part of
the rachis, prophyll and peduncular bract not seen,
rachis c. 45 cm long, with 7 – 10 branched and 5 – 8
unbranched first order branches, the proximal first
order branches with a rachis to 40 cm long, rounded,
with up to 13 branched and 15 unbranched second
order branches, covered with minute scattered scales;
rachillae 7 – 9 cm long, spreading, densely puberulous,
triads distant, in shallow pits. Flowers and fruits not seen.
Fig. 1.
DISTRIBUTION. Known only from Vatovelona forest,
c. 10 km S of the village Manakambahiny 1, buffer
zone for the Zahamena strict nature reserve.
SPECIMEN EXAMINED. MADAGASCAR. Toamasina, Vavatenina, Vatovelona forest; 17°40 ′S, 49°00 ′E, 12 Oct. 1998,
A. Byg 1 (holotype K!; isotype AAU!).
HABITAT. Undergrowth in lowland humid forest, steep
slope near river and small foot path; 580 m.
CONSERVATION STATUS. Critically Endangered [CR,
B1a+b(iii)]. Known only from a single site on the
boundary of Zahamena Natural Reserve, in a piece of
forest of 7 km2. The palm population is protected;
however, its habitat is fragmented and local villagers
are allowed with regulation to enter the forest and use
its natural resources. This species and its habitat are
thus threatened.
NOTES. This species is similar to Dypsis ovobontsira, by
having regularly arranged leaflets and in the leaf sheath
indumentum. The leaves are, however, strongly curved
and the inflorescence is smaller in size, and more highly
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
KEW BULLETIN VOL. 65(2)
branched. The specific epithet alludes to the locality —
Vatovelona — which means a shrine in Malagasy.
2. Dypsis dracaenoides Rakotoarin. & J. Dransf. sp.
nov. D. scottianae (Becc.) Beentje & J. Dransf. et D.
macdonaldianae Beentje affinis sed foliis porrectis
brevibus polymorphis, integris vel anguste dissectis
differt. Typus: Madagascar, Fianarantsoa, Vondrozo,
Madiorano, M. Rakotoarinivo et al. 312 (holotypus K!;
isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105549-1
Clustering palm with 2 – 5 stems per clump, occasionally
solitary, erect or sometimes leaning. Stems 2.5 – 4 m high,
0.8 – 1.5 cm diam.; internodes 0.8 – 4 cm long, covered
with red scales in the distal part, proximal part with
corky lenticels. Leaves 8 – 12 in the crown, forming a
shuttlecock; sheath pale green, covered with red brown
scales, 18.5 – 25 cm long, 1.5 – 2.2 cm wide, with
auricles 5 – 6 × 0.6 – 1 cm; petiole absent or up to 4 cm
long, occasionally densely scaly, adaxially flattened,
abaxially rounded; rachis 16 – 38 cm long, tapering
from c. 1 cm diam. at the base, adaxially flattened near
the base, keeled towards the apex, abaxially angled,
minutely scaly, blade coriaceous; lamina entire and
deeply bifid or dissected; entire leaves 70 – 104 cm
long, 10 – 16 cm wide, abaxially with scattered scales,
ramenta very sparse, main veins 6 – 8 in each side of the
rachis, apex dentate, lobe 55 – 80 cm, pinnate leaves
with 8 – 9 very narrow leaflets on each side of the
rachis, somewhat irregularly arranged, spaced at about
0.6 – 5.5 cm, proximal leaflets 41 – 60 × 0.5 – 0.7 cm,
median leaflets 59 – 76 × 0.5 – 0.7 cm, distal multiplefold leaflets 59 – 70 × 1.3 – 2 cm, main veins 2 – 3,
apices dentate, abaxial surface of leaflets with scattered
scales. Inflorescences interfoliar, pendulous to erect,
branched to 2 orders; peduncle 50 – 68 cm long, 4 –
7 mm diam., brown puberulous; prophyll 18 – 20.5 cm
long, 6.5 – 8 mm wide, inserted at 6 – 6.3 cm from the
base of peduncle, 2-keeled, covered in scattered reddish-brown tomentum, open for 2 – 3.3 cm in the distal
part; peduncular bract 31 – 56 cm long, 4 – 7 mm wide,
inserted at 7 – 10 cm from the base of peduncle,
sparsely scaly with reddish-brown tomentum, apical
beak c. 3 mm, split to 3.3 – 6.5 cm in the distal part;
rachis 20 – 40 cm long, 0.4 – 0.6 cm wide, yellowish,
covered with scattered red scales, with 4 – 9 first
branched rachillae and 8 – 11 unbranched rachillae,
proximal rachillae to 6 cm long with up to 4 rachillae;
rachilla 7 – 16 cm long, c. 1 mm diam., minutely
puberulous, triads distant. Staminate flowers with
sepals 0.8 – 1.3 × 1 – 1.3 mm, imbricate, minutely
scaly, triangular, keeled, slightly asymmetric; petals
2 – 2.1 × 1.6 – 1.8 mm, elliptic, valvate, striate,
coriaceous; stamens 6, equal, filaments 0.5 – 0.7 mm
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
281
Fig. 1. Dypsis sancta. A partial habit; B apical leaflets; C mid-leaflets; D inflorescence. All from A. Byg 1. Scale bar: A = 10 cm, B,
C = 8 cm, D = 6 cm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
282
long, c. 0.1 mm wide, anthers versatile, medifixed,
elongate, 1.2 – 1.4 × 0.4 – 0.5 mm; pistillode obovoid,
c. 0.4 mm high. Pistillate flowers with sepals 1.2 – 1.4 ×
1.1 – 1.3 mm, minutely scaly, triangular, asymmetric;
petals 2.2 – 2.4 × 1.1 – 1.4 mm, elliptic, striate,
imbricate, coriaceous; staminodes minute; gynoecium
c. 1.7 × 1 mm. Fruit not seen. Fig. 2.
DISTRIBUTION. Known only from Vondrozo forest,
southeast of Madagascar.
SPECIMENS EXAMINED. MADAGASCAR. Fianarantsoa,
Vondrozo, Madiorano, 22°47 ′39 ″S, 47°11 ′18 ″E, 23 Oct.
2006, M. Rakotoarinivo et al. 312 (holotype K!; isotype
TAN!); M. Rakotoarinivo et al. 316 (K!, TAN!).
HABITAT. Lowland humid forest and rather dry montane forest in the western part of Vondrozo. Common
palm in valleys and on lower slopes; 550 – 600 m.
CONSERVATION STATUS. Vunerable [VU (D2)]. Known
only from an area about 15 km2, in the west of Vondrozo.
About 100 mature individuals have been observed and
the forest where it occurs is managed by the local
population. Illegal logging and mining activities
continue and increase the threats to this species, in
particular through habitat loss and degradation.
VERNACULAR NAME. Tavosy.
NOTES. The dissected-leaved form of this beautiful
species bears an uncanny resemblance to Dracaena
(Dracaenaceae), hence the specific epithet. This new
species is related to group 4 of Dypsis (Dransfield &
Beentje 1995), which includes six palms of the southern part of the rainforest in Madagascar. The group
includes multi-stemmed undergrowth palms with six
equal stamens. The new species is immediately distinguished by its striking leaf polymorphism and inflorescence structure.
3. Dypsis metallica Rakotoarin. & J. Dransf., sp. nov., D.
luteae (Jum.) Beentje & J. Dransf. affinis sed folio
metallico coriaceo linea centrali lutescenti differt.
Typus: Madagascar, Antsiranana, Antalaha: Masoala
Peninsula, Sahamalaza, Iketra, J. Dransfield et al. JD
7636 (holotypus K!; isotypus TAN!).
KEW BULLETIN VOL. 65(2)
long, 9.5 – 27 cm wide, midrib 19 – 33 cm long,
lobes 17 – 21 × 15 – 16 cm, apices narrowly dentate,
adaxial surface of the leaf with minute punctiform
scales, abaxially with scales on the midrib and
minute punctiform scales along the veins. Inflorescence interfoliar, branching to 2 orders; peduncle 28 –
32 cm long, 3 – 5 mm diam., densely hairy in exposed
parts; prophyll 14 – 17 × 0.8 – 1 cm, inserted at 6 –
7.5 cm from the base of peduncle, splitting distally
for 1.5 – 2.5 cm, 2-keeled; peduncular bract deciduous; rachis 12.5 – 15 cm long, minutely to densely
puberulous, with 6 – 9 branched and 7 – 9
unbranched first order branches; rachillae 5 –
8.5 cm long, 1 – 1.5 mm diam., glabrous, triads
inserted at distances of 1.5 – 3 mm. Staminate flowers
with sepals 0.8 – 1 × 0.8 – 1.1 mm; petals elliptic, 1.2
– 1.5 × 0.8 – 1 mm, striate; stamens 6, uniseriate,
filaments c. 0.2 mm long, anthers 0.6 – 0.8 × 0.2 –
0.5 mm, elongate; pistillode minute, c. 0.2 mm high.
Pistillate flowers with sepals 0.9 – 1.1 × 0.8 – 1 mm; petals
0.7 – 0.8 × 0.5 – 0.6 mm, striate, staminodes absent;
gynoecium c. 0.6 × 0.4 mm. Fruits not seen. Fig. 3.
DISTRIBUTION. Northeast of Madagascar, known only
from Sahamalaza area, on the east side of Masoala
Peninsula.
SPECIMEN EXAMINED. MADAGASCAR. Antsiranana,
Antalaha: Masoala Peninsula, Sahamalaza, Iketra,
15°44 ′S, 50°13 ″E, 16 Nov. 1996, J. Dransfield et al. JD
7636 (holotype K!; isotype TAN!).
HABITAT. Heath forest developed on white sands
associated with river terraces; 40 m.
CONSERVATION STATUS. Vulnerable [VU (D2)],
known only from Sahamalaza in the eastern part of
the Masoala Peninsula. The population is estimated to
occur in an area of 6 km2, within the Masoala National
Park. Access is difficult and restricted.
VERNACULAR NAME. Sinkiara.
NOTES. This species belongs to the informal Group
5 (Dransfield & Beentje 1995) and keys to Dypsis lutea.
It is distinguished by being altogether more robust and
by its unusual metallic-hued coriaceous leaves. This
species is of high ornamental value. The species
epithet refers to the metallic blue green leaves.
http://www.ipni.org/urn:lsid:ipni.org:names:77105553-1
Clustering palm. Stem to 5 m tall, 1 – 2 cm diam., dark
green, internodes 2.5 – 3 cm long near the crown, with
reddish indumentum. Leaves 6 – 10 in the crown;
sheaths 12 – 20 cm long, 1.5 – 2 cm diam., closed,
forming a well-developed crownshaft, abaxially covered
with purplish indumentum mostly in the upper part,
with triangular auricles, 1.2 – 2.5 × 0.2 – 0.5 cm; petiole
7 – 11 cm long, 2 – 4 mm wide, adaxially flat or slightly
channelled, abaxially rounded, scaly; blade entire bifid,
very coriaceous, metallic blue-green with a central
pale yellowish line, the entire lamina 39 – 54 cm
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
4. Dypsis reflexa Rakotoarin. & J. Dransf. sp. nov. D.
caudatae Beentje affinis sed ramis inflorescentiae
plurimis valde reflexis differt. Typus: Madagascar,
Antsiranana, Antalaha, Sahamalaza, J. Dransfield et al.
JD 7640 (holotypus K!; isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105554-1
Clustering palm with c. 8 stems. Stems to 3 m tall, c. 1 cm
diam.; internodes 2.5 – 4 cm long, blackish, slightly
scaly. Leaves 6 – 8 in the crown, pinnate; sheaths 9 –
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
283
Fig. 2. Dypsis dracaenoides. A habit with pinnate leaves; B habit with entire bifid leaves; C pinnate leaf; D leaf sheath of the entire
bifid leaf; E lamina of the entire bifid leaf; F inflorescence. A, C from M. Rakotoarinivo 316. B, D, E from M. Rakotoarinivo 312.
Scale bar: A, B = 12 cm, C – F, = 8 cm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
284
KEW BULLETIN VOL. 65(2)
Fig. 3. Dypsis metallica. A habit; B leaf and inflorescence; C detail of indumentum on the abaxial surface of the leaf blade. All from
J. Dransfield JD 7636. Scale bar: A = 8 cm, B = 4 cm, C = 2 cm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
10.5 cm long, 1.2 – 1.5 cm wide, forming a well-defined
crownshaft, auricles c. 1 mm long, splitting for 4 –
4.5 cm distally, pale green with brown scales; petiole 8 –
9 cm long, 4 – 5 mm wide, densely covered with reddish
scales, adaxially channelled; rachis 45 – 55 cm long, in
mid-leaf 2 – 3 mm wide, densely scaly; leaflets c. 20 on
each side of the rachis, arranged in groups of 2 – 4, at
intervals of 2 – 3.5 cm, abaxial surface glabrous, apices
1.8 – 3.2 cm, proximal leaflets 6 – 6.5 × 0.8 – 1.2 cm,
median leaflets 9 – 9.8 × 1.2 – 1.7 cm, distal leaflets
7.2 – 8 × 0.7 – 1.1 cm, with 2 – 5 main veins.
Inflorescence interfoliar, branched to 2 orders, arching to
pendulous; peduncle c. 28 cm long, c. 3 mm diam.
distally, densely covered with rusty brown hairs; prophyll
23 cm long, c. 7 mm wide, dark brown, 2-keeled, with
scattered scales on the adaxial surface, ± glabrous on the
abaxial surface, splitting distally for 2.6 cm; peduncular
bract deciduous, not seen; non-tubular peduncular
bract occasionally present; rachis c. 34 cm long, 2 –
4 mm diam., with 7 branched and 17 unbranched first
order branches, minutely puberulous; rachillae divaricate
and reflexed, zigzag, orange, 2.6 – 4.2 cm long, 1 – 2 mm
diam., minutely scaly at the base but soon glabrescent,
triads inserted at distances of 1.4 – 2.2 mm. Staminate
flowers with imbricate sepals 1.2 – 1.7 × 1.6 – 2.3 cm,
minutely scaly; petals 2 – 2.2 × 1.6 – 1.7 cm, valvate,
striate; stamens 6, equal, filaments 0.4 – 0.6 mm, anthers
c. 1.1 mm long, elongate, basifixed; pistillode 1.2 mm
high. Pistillate flowers not developed. Fig. 4.
DISTRIBUTION. Northeast of Madagascar, known only from
Sahamalaza area, on the east side of Masoala Peninsula.
SPECIMEN EXAMINED. MADAGASCAR. Antsiranana,
Antalaha, Sahamalaza, Iketra, Tanany Rabepierre,
15°44 ′S, 50°13 ″E, 17 Nov. 1996, J. Dransfield et al. JD
7640 (holotype K!; isotype TAN!).
HABITAT. Lowland forest, on gentle slopes; 40 m.
CONSERVATION STATUS. Vulnerable [VU (D2)],
restricted to Sahamalaza, in the eastern part of the
Masoala Peninsula. The population of this species
occurs in an area estimated to be 6 km2, within the
boundary of Masoala National Park.
NOTES. This species belongs to group 5 of Dypsis, as
defined by Dransfield & Beentje (1995). It is similar to
D. caudata but differs in the inflorescence being
branched to two orders and in having a zigzag rachis.
The species epithet refers to the reflexed inflorescence branches.
5. Dypsis gronophyllum Rakotoarin. & J. Dransf. sp.
nov. foliolis praemorsis D. trapezoideae J. Dransf. et
D. thiryanae (Becc.) Beentje & J. Dransf. affinis sed
habitu multo maiore, inflorescentia robustiori bene
distincta. Typus: Madagascar, Fianarantsoa, Vondrozo:
Madiorano, Anivontany, M. Rakotoarinivo et al. 350
(holotypus K; isotypus TAN).
285
http://www.ipni.org/urn:lsid:ipni.org:names:77105551-1
Clustering palm with 2 – 4 stems. Stems slender, to 4 m
tall, 1 – 1.5 cm diam., erect, grey brown, internodes
1 – 4 cm long, covered with red scales below the crown,
lenticels present in the lower part of the stems, nodal
scars 1 – 2 mm wide. Leaves 7 – 12 in the crown,
pinnate, porrect to spreading; sheaths 11 – 13.8 cm
long, 1.4 – 2 cm diam., open for 2.2 – 7 cm in the
upper part, forming a well defined crownshaft,
sparsely to densely covered in red hairs on the abaxial
surface, auricles 1.8 – 3.4 × 0.3 – 0.7 cm; petiole 1.7 –
5 cm long, c. 4 mm wide, adaxially flattened, abaxially
rounded, scaly; leaf rachis 19.5 – 37 cm long, in midleaf 1 – 1.5 mm wide, triangular in cross section;
leaflets irregularly arranged, 7 – 9 on each side of the
rachis, at intervals of 1.4 – 8 cm, blade leathery, dark
bluish green, proximal leaflets 9 – 18 × 0.8 – 1.4 cm,
median leaflets 7 – 15 × 2.2 – 3 cm, distal leaflets 5 –
9 × 2.4 – 3.5 cm, irregularly praemorse, bands of
scattered red scales along margins and occasionally
on the major and minor veins. Inflorescence interfoliar,
branching to 1 or 2 orders, peduncle 28 – 42 cm long,
4 – 5 mm diam., densely hairy in exposed parts;
prophyll 9 – 13 × 0.8 – 1 cm, inserted at 2 – 5 cm from
the base of the peduncle, distal part open for 2 –
3.5 cm, 2-keeled, sparsely to densely scaly; peduncular
bract inserted at about 10 cm from the base of the
peduncle, 24 – 27 cm long, c. 7 mm in the cross
section, split to 3 – 5 cm, scaly, persistent; rachis 14 –
20 cm long, densely puberulous, with 4 – 6 branched
and/or 7 – 11 unbranched first order branches;
rachillae 3.6 – 8 cm long, 1 – 1.5 mm diam., glabrous,
triads inserted at a distance of 1.5 – 3 mm, axis in first
order branches up to 3 cm long. Staminate flowers with
sepals c. 0.8 × 1 mm, imbricate, slightly waxy; petals 3,
ellipsoid, valvate, striate, c. 1.5 × 1 mm; stamens 6,
uniseriate, filaments c. 0.4 mm, anthers 0.8 – 1 × 0.2 –
0.5 mm, elongate, medifixed, versatile; pistillode
minute, c. 0.8 mm. Pistillate flowers with sepals , c. 0.8 –
1 × 1 – 1.5 mm, imbricate, keeled, irregularly waxy,
dentate at the margins; petals 3, c. 2 × 1 mm, ellipsoid,
striate; gynoecium c. 1 mm high, staminodes 6, much
smaller and encircling the gynoecium. Fruits not seen.
Fig. 5.
DISTRIBUTION. Southeast of Madagascar, known only
from the forest of Vondrozo.
SPECIMEN EXAMINED. MADAGASCAR. Fianarantsoa,
Vondrozo: Madiorano, Anivontany, 3 Sept. 2007, M.
Rakotoarinivo et al. 350 (holotype K!; isotype TAN!).
HABITAT. Lowland humid evergreen forest on white
sands, in valley bottoms in very humid forest;
590 m.
CONSERVATION STATUS. Critically Endangered [CR
(B2a+b(iii); D)]. Known only from Vondrozo where it
is restricted to humid areas, all of these in an area less
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
286
KEW BULLETIN VOL. 65(2)
Fig. 4. Dypsis reflexa. A habit with leaf and inflorescence. From J. Dransfield JD 7640. Scale bar: A = 8 cm.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
DRAWN BY LUCY T. SMITH.
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
287
Fig. 5. Dypsis gronophyllum. A habit; B leaf; C crown with inflorescence; D detail of indument on leaf sheath. All from
M. Rakotoarinivo 350. Scale bar: A = 15 cm, B, C = 6 cm, D = 1 cm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
288
than 10 km2. About 40 mature individuals have been
seen in the field while its habitat is subject to human
exploitation for wood or for other natural resources.
NOTES. Related to the species defined by Dransfield &
Beentje (1995) in group 8 of Dypsis. This species
differs from Dypsis thiryana and D. trapezoidea in its
much larger habit, its much broader and thicker
leaflets and much more robust inflorescences. It
differs from D. schatzii Beentje by its larger size and
the pinnate leaves with praemorse leaflets instead of
possessing an entire bifid leaf. The species epithet is
based on the Greek for eroded or grooved leaf,
referring to the praemorse leaflet tips, but it also
alludes to the striking resemblance in habit between
this Dypsis and the completely unrelated Hydriastele
pinangoides (Becc.) W. J. Baker & Loo from New
Guinea, previously included in the now synonymised
genus Gronophyllum.
6. Dypsis vonitrandambo Rakotoarin. & J. Dransf., sp.
nov., D. pusillae Beentje similis sed foliolis late
lanceolatis vice linearibus et inflorescentia robustiore
rachillis paucioribus differt. Typus: Madagascar, Antsiranana, Antalaha: Masoala Peninsula, Sahamalaza,
Nov. 1996, J. Dransfield et al. JD 7631 (holotypus K!;
isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105556-1
Solitary palm. Trunk to 1 m high, c. 5 cm diam.,
entirely covered by persistent fibres (piassava) about
5 cm, the fibres large, short, not pendulous; trunk
supported by stilt roots to 50 cm above ground. Leaves
7 – 10 in the crown; sheaths up to 20 cm long with
fibrous margins, not forming a crownshaft; petiole
60 – 100 cm long, densely rusty-scaly, adaxially
channelled with sharp edges, abaxially ridged; rachis
70 – 90 cm long, in mid-leaf 5 – 7 × 4 mm diam., scaly,
strongly keeled; emerging leaflets deep reddish
brown, soon becoming green; leaflets regularly
arranged, c. 9 on each side of the rachis, bright green,
leaflets broad, lanceolate, the proximal 50 – 55 × 3 –
3.2 cm, the median 72 – 80 × 5.5 – 7 cm, the distal 12
– 27 × 1.5 – 7 cm, main veins 3 – 6, punctiform scales
present on the margins and at the leaflet insertion,
apices attenuate. Inflorescence interfoliar, erect, emerging from among the fibrous mass of piassava,
branched to 1 order; peduncle 65 – 80 cm long,
proximally 5 – 6 × 3 – 5 mm diam., distally 2 – 5 ×
1.5 – 4 mm diam., green, with few scattered reddish
scales distally; prophyll not seen; peduncular bract
inserted at 25 – 40 cm from the base, 30 – 45 cm
long, pale brown with many patches of dense reddish
scales, persistent, with an apical beak 2 – 2.5 cm;
rachis 5 – 8 cm long, scaly, with 13 – 18 branches;
rachillae 11 – 22 cm long, 1 – 2 mm diam., densely
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
KEW BULLETIN VOL. 65(2)
scaly, triads distant. Staminate flowers with sepals 0.6 –
1 × 0.8 – 1.2 mm, asymmetrical; petals 1.4 – 1.8 ×
0.6 – 0.8 mm; stamens 6, biseriate; 3 antesepalous
sessile, 3 antepetalous with filaments 0.6 – 0.8 mm
long; anthers c. 0.1 × 0.2 mm; pistillode 0.9 – 1 ×
0.5 – 0.7 mm. Pistillate flowers with sepals 0.6 – 0.8 ×
0.8 – 1 mm, asymmetrical; petals 1.2 – 1.4 × 1 –
1.2 mm; gynoecium c. 1.2 × 0.6 mm. Fruits young,
black, obovoid, c. 6 × 5 mm. Fig. 6.
DISTRIBUTION. Northeast Madagascar, known only
from Sahamalaza, on the eastern side of the Masoala
Peninsula.
SPECIMEN EXAMINED. MADAGASCAR. Antsiranana,
Antalaha: Masoala Peninsula, Sahamalaza, Iketra,
Tanany Rabepierre, 15°45 ′S, 50°12 ′E, 15 Nov. 1996,
J. Dransfield et al. JD 7631 (holotype K!; isotype TAN!).
HABITAT. Lowland forest on granite, valley bottom,
streamside; 25 m.
CONSERVATION STATUS. Vulnerable [VU (D2)],
restricted to the eastern part of the Masoala Peninsula
and known only from an area less than 10 km2, within
the boundary of the National Park.
VERNACULAR NAME. Vonitrandambo.
NOTES. This species belongs to the “Vonitra” group
(Group 16 of Dransfield & Beentje 1995) where the
species tend to be very finely differentiated (see
Dransfield & Beentje 1995). It is close to Dypsis pusilla
but differs by having fewer but strikingly broader
leaflets on the rachis, and much more robust inflorescences that bear fewer rachillae. D. pusilla is
confined to lowland forest around the Bay of Antongil,
from the west coast of the Masoala Peninsula to
Antanambe, whereas D. vonitrandambo is restricted to
the eastern side of the Masoala Peninsula. The species
epithet is based on the vernacular name.
7. Dypsis culminis Rakotoarin. & J. Dransf. sp. nov.
inflorescentia et floribis staminatis D. procumbenti (Jum.
& H. Perrier) J. Dransf., Beentje & Govaerts verosimiliter affinis sed foliis bifidis vice pinnatis differt. Typus:
Madagascar, Fianarantsoa, Vondrozo, Madiorano, M.
Rakotoarinivo 335 (holotypus K!; isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105548-1
Clustering undergrowth palm with 4 – 8 stems. Stems
to 3 m tall, 1.4 – 2 cm diam., internodes 12 – 30 mm,
brown, covered in scattered reddish-brown pubescence in the distal part. Leaves 9 – 12 in the crown;
sheaths 11 – 13 × 1.3 – 1.5 cm, longitudinally striate,
covered in sparse to dense red-brown scales, crownshaft well defined, leaf sheath split to 4 – 6 cm distally,
auricles triangular, 2.6 – 3.3 × 0.2 – 0.6 cm; petiole
3.2 – 10 cm long, sparsely scaly, deeply channelled
on the adaxial surface; rachis 49 – 54 cm long,
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
289
Fig. 6. Dypsis vonitrandambo. A apical leaflets; B mid-leaf leaflets; C inflorescence; D peduncular bract; E upper part of the trunk
with fibrous leaf sheath margins; F stilt roots. All from J. Dransfield JD 7631. Scale bar: A – F = 6 cm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
290
brown to pale yellow, minutely scaly; leaf blade entire
bifid, 59 – 64 × 8.8 – 9.5 cm with an apical notch 7 –
9.5 cm, apex toothed, lamina leathery, abaxially
covered in thin grey scales and very few small
ramenta, main veins numerous. Inflorescence interfoliar, erect, branched to 1 order; peduncle 28 – 33 cm
long, 3 – 5 mm wide, glabrous; prophyll c. 10 × 0.7 cm,
brown, sparsely scaly, keeled, inserted at c. 2 cm from
the base of the peduncle, open at 1.7 – 3 cm distally;
peduncular bract persistent, c. 24 × 0.6 cm, minutely
to densely scaly in the proximal part, inserted at c.
6 cm from the base of the peduncle, split to 3 – 4 cm
in the distal part; rachis 7 – 16 cm long, pale green to
yellowish, minutely puberulous; rachillae 6 – 9, yellowish, 7 – 13 cm long, c. 1 mm wide, with rather distant
triads. Staminate flowers with imbricate sepals, 1 – 1.1 ×
0.8 – 1.1 mm, keeled, margins erose; petals 1 – 1.2 ×
0.7 – 0.8 mm, valvate, elliptic, striate; stamens 6, equal,
filaments c. 0.2 mm, anthers medifixed, not versatile,
c. 0.4 mm long, pistillode trilobed, c. 0.5 mm high.
Pistillate flowers with imbricate sepals, 0.8 – 1.2 × 0.8 –
1.2 mm, slightly asymmetrical, keeled, margins
minutely erose; petals 1 – 1.1 × 0.7 – 0.8 mm, valvate,
striate, elliptic; gynoecium c. 0.5 × 0.4 mm, hexagonal.
Fruits not seen. Fig. 7.
DISTRIBUTION. Known only from Vondrozo forest,
southeast Madagascar.
SPECIMEN EXAMINED. MADAGASCAR. Fianarantsoa,
Vondrozo, Madiorano, 22°48 ′15 ″S, 47°16 ′29 ″E, 28
Oct. 2006, M. Rakotoarinivo 335 (holotype K!; isotype
TAN!).
HABITAT. Lowland humid forest, only on higher slopes
and ridge crests; 600 m.
CONSERVATION STATUS. Critically Endangered [CR
(B2a+b(ii,iii); D)]. Rare species, only two mature
individuals have been seen on a single mountain ridge
where the forest on the lower slopes is being cleared.
NOTES. This new species has an inflorescence and
staminate flowers comparable with those of Dypsis
procumbens but it differs from this latter in its entire
bifid leaves.
8. Dypsis anjae Rakotoarin. & J. Dransf. sp. nov. Dypsis
delicatulae Britt & J. Dransf. et D. pulchellae J. Dransf.
verosimiliter affinis; a D. delicatula inflorescentia rachillis
paucioribus robustioribus et a D. pulchella folio minus
profunde fissa et rachillis pauciorbus et robustioribus
differt. Typus: Madagascar, Toamasina, Vavatenina, RNI
Zahamena, L. J. Razafitsalama et al. 146 (fr.) (holotypus
K!; isotypi CNARP!, MO!, P!, TEF!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105546-1
Slender clustering or occasionally solitary palm. Stems
to 3 m high, c. 5 – 10 mm diam., internodes 0.8 – 4 cm
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
KEW BULLETIN VOL. 65(2)
long, dark green with caducous black scales. Leaves
entire bifid, 6 – 15 in the crown, spreading; sheaths
6 – 7 cm long, open for 1 – 1.6 cm in the distal part,
forming a short crownshaft, pale green, with reddish
scattered scales, auricles narrow, c. 0.8 × 0.6 mm;
petiole 0.9 – 4.5 cm long, c. 2 mm diam., sparsely to
densely scaly; blade leathery, obtriangular, 15 – 27 cm
long, 3 – 4.8 cm wide, dark green; midrib 11 – 21 cm
long, lobes 4.2 – 10 × 2 – 2.8 cm, main veins 5 – 10,
apices minutely dentate. Inflorescence interfoliar,
branched to 1 order; peduncle c. 9.5 cm long,
c. 2 mm diam., glabrescent; prophyll 6.5 cm long,
0.6 cm wide, split in the distal 2 cm, glabrescent;
peduncular bract persistent, 9.4 cm long, glabrous,
purplish to brown, inserted at 4.3 cm from the base of
peduncle, split for 3.6 cm in the distal part; rachis
2.4 cm, puberulous at anthesis but glabrous in fruit;
rachillae c. 5 2.5 – 4 cm long, 0.8 – 1.2 mm thick,
triads distant, flowers yellow. Staminate flowers with
sepals 1.5 – 1.9 × 2 – 3 mm, imbricate, keeled,
asymmetric; petals 4.5 – 7.2 × 2.3 – 3.8 mm, elliptic,
imbricate; stamens 6, uniseriate, filaments c. 0.3 mm;
anthers medifixed, versatile, elongate, 2.4 – 2.8 × 0.7 –
1 mm; pistillode c. 1.1 × 0.7 mm. Pistillate flowers with
sepals imbricate, 2.1 – 2.7 × 3 – 3.2 mm; petals elliptic,
beaked, imbricate, minutely puberulous, 4.2 – 4.8 ×
2.7 – 3 mm; gynoecium 4.2 – 4.8 × 2.7 – 3 mm. Fruits
reddish, ellipsoid, curved at the apex, 5.2 – 5.5 × 2.1 –
2.2 mm, mesocarp fibrous, stigmatic remains sub-basal.
Seeds ellipsoid, curved, c. 4.3 × 1.7 mm, embryo lateral,
endosperm homogenous. Fig. 8.
DISTRIBUTION. East of Madagascar, known only from
buffer zone of Zahamena Natural Reserve in the area
of Vavatenina.
SPECIMENS EXAMINED. MADAGASCAR. Toamasina,
Vavatenina, RNI Zahamena, 17°40 ′S, 49°00 ′E, 16 Oct.
1998, A. Byg 16 (fl.) (AAU, K); idem 17°39 ′10 ″S,
48°58 ′07 ″E, 24 Oct. 2002, L. J. Razafitsalama et al. 146
(fr.) (holotype K!; isotypes CNARP!, MO!, P!, TEF!).
HABITAT. Humid lowland forest with closed canopy,
on gentle slopes; 580 – 600 m.
CONSERVATION STATUS. Critically Endangered [CR,
B1a+b(iii)]. Known only from the buffer zone of
Zahamena Natural Reserve, in an area calculated as
17.8 km2. Although this species occurs in a protected
area, its habitat may be disturbed sporadically by the
incursion of local villagers looking for wood and other
forest products.
VERNACULAR NAME. Sinkaramboalavo (Betsimisaraka).
NOTES. Belonging to informal Group 8, superficially
Dypsis anjae seems similar to D. delicatula and
D. pulchella; the former has extremely slender short
and numerous rachillae, very different from the rather
far fewer and more robust rachillae of D. anjae while
D. pulchella has a more deeply cleft leaf and more
numerous, more robust and longer rachillae. It is one
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
291
Fig. 7. Dypsis culminis. A general habit; B crown with inflorescence. All from M. Rakotoarinivo 335. Scale bar: A = 30 cm, B = 6 cm.
DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
292
KEW BULLETIN VOL. 65(2)
Fig. 8. Dypsis anjae. A crown with inflorescence; B fruit; C seed, T.S. All from J. L Razafitsalama et al. 146. Scale bar: A = 3 cm,
B, C = 2.5 mm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
293
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
of the smallest palms in Madagascar. The species is
named for the first collector of this palm, Anja Byg.
9. Dypsis jeremiei Rakotoarin. & J. Dransf. sp. nov.
Inflorescentia foliis D. procumbenti similis sed endospermio ruminato bene distincta; a D. nodifera Mart.
habitu caespitoso foliolis anguste linearibus differt
inflorescenti in 1 (2) ordines ramificanti. Typus:
Madagascar, Toamasina, Soanierana Ivongo, Ambatovaky Reserve: Iampirano, Dec. 2003, J. L. Razafitsalama
et al. 558 (holotypus K!; isotypi MO, TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105552-1
Clustering palm. Stems up to 2 m high, to 2 cm diam.,
internodes 3 – 6 cm long. Leaves 8 – 10 in the crown;
sheath 25 – 28 cm long, 1 – 1.6 cm diam., pale green,
forming a well defined crownshaft, glabrous, auricles
absent; petiole 16 – 27 cm long, c. 4 mm diam., with
scattered grey scales, adaxially slightly channelled; rachis
46 – 67 cm long, in mid-leaf c. 4 mm wide, pubescent on
adaxial surface and with scattered scales abaxially; leaflets 10 – 14 on each side of the rachis, irregularly
arranged in scattered groups, proximal leaflets 16.5 – 24
× 1.2 – 2.7 cm, median leaflets 18 – 27 × 1.7 – 2.6 cm,
distal leaflets often multifold, 11.2 – 12.5 × 1.4 – 4.6 cm,
main veins 1 – 3, apices 4 – 6.5 cm wide, lamina surfaces
minutely scaly. Inflorescence interfoliar, branched to 1
(– 2) order(s), erect; peduncle 15 – 32.5 cm long, 3 –
5 mm wide, glabrous to slightly scaly; prophyll 7.8 –
14 cm long, c. 8 mm wide, borne at the base of the
peduncle, split in the distal 6 – 8 mm, glabrous;
peduncular bract marcescent, inserted at 5.3 – 7.6 cm
from the base of the peduncle, 13.2 – 26 cm long,
glabrous, split to about 4 – 5.5 cm along its length in the
distal part, with a beak c. 2 mm long; rachis 11 – 16.5 cm
long, densely pubescent, with 0 (1) branched and 6 – 12
unbranched first order branches; rachillae 7.5 – 18 cm
long, 1.5 – 2 mm diam., scaly, triads distant. Staminate
flowers with sepals 1.5 – 2 × 0.8 – 1 mm, asymmetrical;
petals 2 – 2.3 × 1 – 1.2 mm; stamens 6, biseriate,
filaments 0.3 – 0.5 mm, anthers 1 – 1.2 × 0.4 mm,
elongate, dorsifixed; pistillode 0.4 – 0.7 mm high,
c. 0.2 mm diam. Pistillate flowers with sepals 1 – 1.8 ×
0.8 – 1.2 mm; petals 0.8 – 1.1 × 0.6 – 0.8 mm; gynoecium
c. 0.6 × 0.4 mm. Fruits ellipsoid, 9 – 12 × 4 – 5 mm, red;
endocarp fibrous. Seed 9 – 10 × 2.5 – 3 mm, endosperm
deeply ruminate. Fig. 9.
DISTRIBUTION. Northeast Madagascar, known only
from Iampirano area, in Ambatovaky Reserve.
SPECIMEN EXAMINED. MADAGASCAR. Toamasina: Soanierana Ivongo, Ambatovaky Reserve: 2 km NW of
Iampirano, 16°48 ′28 ″S 49°10 ′12 ″E, 13 Dec. 2003, J. L.
Razafitsalama et al. 558 (holotype K!; isotypes MO,
TAN!).
HABITAT. Middle altitude forest, on rocky substratum;
946 m.
CONSERVATION STATUS. Vulnerable [VU (D2)],
restricted to Ambatovaky Reserve where the species
has been recorded from a patch of forest less than
5 km2.
NOTES. In inflorescence structure and vegetative habit
this species resembles Dypsis procumbens but it is
immediately distinguishable by its deeply ruminate
endosperm. It appears to belong to the informal
Group 17 (D. nodifera) by virtue of the ruminate
endosperm, but it can immediately be distinguished
from D. nodifera by the very different leaflet arrangement and form, the absence of swellings at the bases
of the leaflets and the inflorescence branched to 1
(rarely 2) order. The species is named for the
collector, Jeremie (Jimmy) Razafitsalama.
10. Dypsis betsimisarakae Rakotoarin. & J. Dransf.
sp. nov. endospermio ruminato D. nodiferae affinis
sed habitu caespitoso foliolis linearibus basin vix
nodosis differt. Typus: Madagaascar, Soanierana
Ivongo, Ambatovaky Reserve, Britt et al. AB53 (holotypus
K!; isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105547-1
Clustering palm with 2 – 5 stems or rarely solitary.
Stems 2 – 6 m tall, 1.5 – 3 cm diam., leaning,
internodes 1.6 – 7 cm long, pale green to grey. Leaves
6 – 9 in the crown, porrect; sheath 19 – 30 cm long,
1.8 – 3.2 cm wide, closed, forming a well defined,
often bulbous crownshaft, pale green or grey, covered
with red scales, auricles triangular 2.6 – 5.5 × 0.3 –
1.2 cm; petiole absent or up to 21 (47) cm long,
proximally 4 – 7 × 3 – 5 mm across, distally 5 – 7 × 2.3
– 3 mm across, densely scaly, adaxially flat or shallowly
channelled; rachis 50 – 107 cm long, in mid-leaf 2 –
4 mm wide, abaxially with scattered scales, adaxially
keeled; leaflets 16 – 26 on each side of the rachis,
grouped or irregular, linear, mostly arranged in the
same plane, in groups of 3 – 6, groups at intervals of
6 – 13 cm, leaflets within the group at intervals of 0.4 –
1.5 cm, rarely swollen at the base, proximal leaflets
12 – 24 × 0.2 – 0.6 cm, median leaflets 21 – 30 × 1.7 –
2.8 cm, distal leaflets 10.5 – 12.5 × 1.2 – 2 cm,
glabrous, apices to 12 cm long, main veins 1 – 5.
Inflorescence infrafoliar, branched to 2 (– 3) orders;
peduncle 10 – 18 cm long, 0.4 – 1 cm wide, scaly;
prophyll 6.5 – 16 cm long, 1.3 – 1.8 cm wide, keeled,
borne at 1.2 – 4 cm above the base of peduncle, split
in the distal 2.6 – 5 cm, scaly; peduncular bract
inserted at 4 – 10.5 cm from the base of peduncle,
21 – 32 cm long, split in the distal 14 – 25 cm,
minutely scaly, beak 1 – 1.5 cm long; rachis 15 – 20 cm
long, scaly or rarely glabrous, with 6 – 8 branched and
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
294
KEW BULLETIN VOL. 65(2)
Fig. 9. Dypsis jeremiei. A whole leaf; B portion of leaf; C inflorescence; D fruit; E fruit in T.S. All from J. L Razafitsalama et al. 558.
Scale bar: A = 24 cm, B = 6 cm, C = 4 cm, D = 4 mm, E = 3.3 mm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
7 – 9 unbranched first order branches; rachillae 11 –
29 cm long, c. 1.5 mm diam., glabrous, pendulous,
triads distant. Staminate flowers with imbricate sepals,
1.8 – 2.2 × 1.8 – 2.5 mm, irregular clefts in the
margins; petals obovate, valvate, not striate, fleshy,
1.6 – 1.9 × 1.4 – 1.6 mm; stamens 6, biseriate,
antesepalous lower than antepetalous, filaments 0.4 –
0.7 × 0.2 – 0.3 mm, anthers 0.5 – 0.7 mm long,
dorsifixed, locules divergent, versatile; pistillode
minute, c. 1.5 mm high. Pistillate flowers with sepals
1.3 – 1.5 × 1.8 – 2 mm, keeled, ± irregular, petals 2.2 –
2.4 × 1.7 – 1.8 mm, obovate, fleshy; gynoecium c. 2.2 ×
1.6 mm. Fruits ellipsoid, red, 0.7 – 1.1 × 0.4 – 0.5 cm,
mesocarp fibrous. Seed ellipsoid, 7 – 8 × 3 – 4 mm,
endosperm deeply ruminate. Fig. 10.
295
sed inflorescentia robustiore rachillis plurimis et endospermio ruminato bene distincta. Typus: Madagascar,
Toamasina, Andilamena, Behorefo, M. Rakotoarinivo et al.
183 (holotypus K; isotypi P!, TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105545-1
DISTRIBUTION. East of Madagascar, between Soanierana Ivongo and Anosibe an’Ala.
SPECIMENS EXAMINED. MADAGASCAR. Toamasina:
Soanierana Ivongo, Ambatovaky reserve, 16°48 ′04 ″S,
49°10 ′21 ″E, 11 Dec. 2003, A. Britt et al. AB45 (K!,
TAN!); idem 16°49 ′06 ″S, 49°11 ′12 ″E, 15 Dec. 2003,
A. Britt et al. AB53 (holotype K!; isotype TAN!);
idem 16°48 ′23 ″S, 49°10 ′33 ″E, 10 Dec. 2003, H. Beentje
4913 (K!, TAN!), idem 16°50 ′43 ″S, 49°10 ′54 ″E, 14
Dec. 2003, H. Beentje 4940 (K!, TAN!), idem
16°47 ′06 ″S, 49°10 ′48 ″E, 15 Dec. 2003, J. L. Razafitsalama
561 (K!, TAN!). Soanierana Ivongo, Befanjana,
16°40 ′11 ″S, 49°36 ′12 ″E, 14 Sept. 2006, M. Rakotoarinivo
et al. 243 (K!, P!, TAN!) & M. Rakotoarinivo et al. 245
(K!, TAN!). Brickaville, Reserve speciale Mangerivola,
Andramangarana, 18°12 ′22 ″S, 48°55 ′29 ″E, 21 July
2006, M. Rakotoarinivo et al. 223 (K!, P!, TAN!).
Anosibe an’ala, Andonabe, 19°19 ′39 ″S, 48°06 ′30 ″E, 16
June 2006, M. Rakotoarinivo et al. 199 (K!, P!, TAN!).
HABITAT. Lowland and middle altitude forest, steep
slopes under more or less open canopy; 300 – 750 m.
CONSERVATION STATUS. Vulnerable [VU (B1a+b(i,ii,
iii, v); C2a)]. Large distribution range (EOO: 9880
km2) but known only from five locations where almost
all of the habitat is subject to human pressure. The
species is losing its habitat.
NOTES. This species would key to Dypsis nodifera, because
of its size, the ruminate endosperm and irregularly
arranged leaflets. However, the habit is almost always
clustering rather than solitary and the leaflets are linear
rather than usually lanceolate, and usually lack the
strong swelling at the leaflet bases. Furthermore, the
leaflets are not twisted at their bases to be displayed in
several planes, and the palm thus has an altogether
different appearance. The species epithet is based on
the name of the ethnic group of people who live in the
general area of the palm’s distribution.
Clustering, climbing palm. Stems to 15 – 20 m long,
1.2 – 1.5 cm diam., flexible, proximally ridged and
cracked vertically with lenticels, internodes 20 – 25 cm
long, bright green near the crown. Leaves 6 – 8 in the
crown, marcescent; sheath 25 – 36 cm long, not
forming a crownshaft, pale green, densely covered
with white wax, scales scattered in the distal part,
auricles to c. 3 mm high; petiole absent; rachis 1.2 –
1.4 m long, 4 – 6 mm wide at the base, tapering to
1 mm distally, triangular but slightly concave on the
adaxial face of the proximal part, minutely scaly;
leaflets 18 – 22 on each side of the rachis, irregularly
arranged, dark green to yellowish, coriaceous, lanceolate, pendulous, twisted at the base, inserted at the
rachis with a woody pulvinus, basal leaflets grouped in
2s, median arranged singly but irregularly and the
distal ones in pairs, proximal leaflets 9 – 14 × 1.1 –
2.4 cm, median leaflets 17 – 21 × 2.8 – 3 cm, distal
leaflets 6 – 9 × 1.4 – 1.8 cm, leaflet tip 3 – 10 cm long,
leaflet surface glabrous. Inflorescences interfoliar, pendulous, branched to 1 or 2 orders; peduncle 43 –
82 cm long, 0.3 – 1 cm wide at the base, densely
covered in red brown tomentum; prophyll inserted
12 – 16 cm above the base of peduncle, 19 – 28 ×
0.7 – 1.2 cm, glabrous or minutely scaly, 2-keeled, split
to 1 – 2.6 cm in the distal part; peduncular bract
deciduous, inserted at 25 – 31 cm from the peduncle
base, 24.5 – 44 × 2.6 – 3.8 cm, with few scattered
scales, with a beak c. 0.5 cm long; rachis 18 – 42 cm,
densely covered in red brown indumentum, up to 5
first order branches branched and 10 – 12
unbranched; rachillae spreading and pendulous,
10 – 26 cm long, c. 1.5 mm diam., glabrous to densely
scaly. Staminate flowers sepals 0.8 – 1.5 × 1.1 – 1.6 mm,
imbricate, unequal, disintegrating at the margins,
ciliolate; petals 2.1 – 2.2 × 1.5 – 1.6 mm, valvate,
striate; stamens 6, biseriate but differing less than
0.2 mm in height, filaments 0.8 – 1 mm, anthers
c. 1.1 – 1.4 mm, medifixed, pistillode minute, 0.6 mm.
Pistillate flowers with sepals 1.4 – 1.5 × 1.2 – 1.5 mm,
imbricate, ciliolate; petals 1.8 – 2 × 0.9 – 1.3 mm, valvate,
striate; gynoecium c. 1.1 × 0.7 mm, ovoid. Fruit ellipsoid,
7.2 – 8.8 × 3.8 – 5.1 mm, yellowish, mesocarp fleshy,
endocarp fibrous. Seed ellipsoid, acute at the apex,
7.5 – 8.4 × 3.6 – 4.2 mm, endosperm deeply ruminate.
Fig. 11.
11. Dypsis andilamenensis Rakotoarin. & J. Dransf.
sp. nov. habitu scandenti D. scandenti J. Dransf. similis
DISTRIBUTION. Known from a single site in the centre
of Madagascar, Andilamena area.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
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Fig. 10. Dypsis betsimisarakae. A leaf; B inflorescence; C fruit; D fruit in L.S.; E fruit in C.S. All from A. Britt et al. 53. Scale bar: A =
8 cm, B = 6 cm, C, D, E = 3.3 mm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
297
Fig. 11. Dypsis andilamenensis. A habit; B leaf; C inflorescence; D portion of rachilla; E male flower; F male flower, L.S.; G fruit; H
seed, L.S.; J seed, T.S. All from M. Rakotoarinivo et al. 183. Scale bar: A = 25 cm, B, C = 8 cm, D = 4 mm, E, F = 1.3 mm, G, H, J =
3.3 mm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
KEW BULLETIN VOL. 65(2)
298
SPECIMEN EXAMINED. Madagascar, Toamasina, Andilamena, Behorefo. 16°59 ′30 ″S, 48°50 ′38 ″E, 6 April
2006, M. Rakotoarinivo et al. 183 (holotype K!; isotypes
P!, TAN!).
HABITAT. Montane forest, with rather open canopy;
750 − 800 m.
CONSERVATION STATUS. Critically Endangered [CR
(B2a+b (iii)]. Known only from a single location
where the Extent of Occurrence is estimated to be
4.3 km2. This species is quite abundant in the field but
its habitat is not protected and is being cleared.
Deforestation and illegal mining for rubies are the
threats to Dypsis andilamenensis.
NOTES. In the field this species was mistaken for Dypsis
scandens, the only other climbing palm known from
Madagascar, but in the herbarium differences soon
became obvious. The ruminate endosperm (homogeneous in D. scandens) immediately recalled D. nodifera,
at the time the only other non-arborescent species in
the genus with ruminate endosperm. Furthermore,
the inflorescences of D. andilamenensis are much more
robust and the whole plant dries deep brown rather
than paler greenish brown. The species epithet is
based on the locality.
inserted c. 15 cm above the base of peduncle, c. 19 ×
1.2 cm, beaked for c. 6 mm, split to 4 cm distally, with
scattered scales; rachis c. 45 cm long, 2 – 8 mm diam.,
densely scaly, with 24 branched and 7 unbranched first
order branches, proximal first order branches to
13 cm long, with 6 branched and 10 unbranched
second order branches, proximally to 2 – 4 × 0.1 –
0.2 cm; rachillae 3 – 5 cm long, c. 0.5 mm diam.,
densely puberulous; triads inserted at intervals of 1.2 –
3.8 mm. Staminate flowers with sepals imbricate,
unequal, 2.2 – 2.6 × 2.6 – 2.8 mm, densely scaly,
keeled, ± asymmetrical; petals imbricate but valvate at
the tip, 3.2 – 3.8 × 2.2 – 2.8 cm, striate, minutely
puberulous; stamens 3, antepetalous, filaments short c.
1 mm long, erect, anthers broad, sagittate, with 2
locules neatly differentiated, 10 – 12 × 5 – 8 mm;
staminodes 3, minute c. 0.4 mm high; pistillode
hexagonal, c. 0.6 mm high. Pistillate flowers with sepals
imbricate, unequal, 2.4 – 2.9 × 2.6 – 2.8 mm, scaly,
asymmetrical, keeled; petals imbricate, 2.8 – 3.4 ×
1.8 – 2.4 mm, striate, elliptic; gynoecium obovoid,
1.4 – 2 × 1.5 – 1.6 mm. Fruits unknown. Fig. 12.
DISTRIBUTION. Known only from Daraina, in the north
of Madagascar.
12. Dypsis gautieri Rakotoarin. & J. Dransf. sp. nov.
D. pinnatifrondi Mart. superficialiter similis sed staminibus
3 antepetalis vice antesepalis et floribus rotundatis
instanter distinguibilis. Typus: Madagascar, Antsiranana,
Vohemar, Daraina, Nov. 2004, L. Gautier, P. Ranirison &
L. Nusbaumer LG 4703 (holotypus K!; isotypus G!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105550-1
Solitary palm. Stems erect, 2 – 5 m high, 1.8 – 3.5 cm
diam., internodes 2.1 – 3 cm, green to grey brown,
minutely scaly near the crown. Leaves c. 9 in the crown,
pinnate; sheaths 17 – 18.5 cm long, 2.8 – 3.5 cm wide,
closed, forming a well defined crownshaft, minutely
scaly in all parts and covered with tomentum in the
upper part, auricles irregularly triangular, to c. 3 – 4 ×
0.4 – 0.6 cm, tattering; petiole absent or up to 2 cm
long; rachis 45 – 55 cm long, c. 0.5 cm diam., densely
covered with scales, adaxially channelled at the base
then triangular in the median and distal parts; leaflets
18 – 22 on each side of the rachis, in groups of 2 – 5,
at intervals of 4 – 9 cm, the leaflets within the group
0.5 – 1 cm apart; proximal leaflets 11 – 12.3 × 0.4 –
0.6 cm, median 18 – 21 × 1.7 – 2.2 cm, distal 12 – 14 ×
2 – 2.5 cm, lamina covered in scattered brown scales,
main veins 3, apices 1.4 – 2 cm long. Inflorescence
interfoliar, branched to 3 – 4 orders, arching;
peduncle c. 40 cm long, 0.8 cm wide, densely covered
in brown scales; prophyll inserted c. 1 cm above the
base of peduncle, c. 15 × 1.5 cm, split to 2.4 cm in the
distal part, scaly, keeled; peduncular bract persistent,
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
SPECIMEN EXAMINED. MADAGASCAR. Antsiranana,
Vohemar, Daraina, 13°13 ′39 ″S, 49°32 ′08 ″E, 11 Nov.
2004, L. Gautier et al. LG 4703 (holotype K!; isotype G!).
HABITAT. Montane forest, crest of ridge; 1040 m.
CONSERVATION STATUS. Vulnerable [VU D2]. Rare
species, less than 20 mature individuals have been
seen but the species is located on the summit of
mountains where access is difficult and the whole area
is protected and managed by Fanamby NGO.
NOTES. Because of the form of the leaves, this species
is superficially like Dypsis pinnatifrons, although substantially smaller. However, the staminate flowers have
three antepetalous stamens with broad sagittate
anthers rather than three antesepalous stamens with
narrow sagittate anthers. It thus belongs to group 18 of
Dransfield & Beentje (1995), some species of which
were originally described in a separate genus, Trichodypsis. It is the only member of the group to have
rather broad lanceolate single-fold leaflets grouped in
tight clusters. The species is named for the collector,
Laurent Gautier who has done much to catalogue the
plant diversity of Daraina, a northern outlier of rain
forest in Madagascar.
Ravenea
1. Ravenea beentjei Rakotoarin. & J. Dransf. sp. nov.
inflorescentiis staminatis et pistillatis solitariis
R. robustiori Jum. & H. Perrier et R. krocianae Beentje
similis, sed trunco non ventricoso, inflorescentiae
rachillis pendulis, floribus staminatis plerumque stam-
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
299
Fig. 12. Dypsis gautieri. A crown with inflorescence; B male flower in bud; C male flower, L.S.; D stamen. All from L. Gautier et al.
LG 4703. Scale bar: A = 8 cm, B, C = 0.85 mm, D = 0.4 mm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
300
inibus 12 vice 6 differt. Typus: Madagascar, Fianarantsoa, Vondrozo, Madiorano, Oct. 2006, M. Rakotoarinivo 317 (holotypus K!; isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105557-1
Medium-sized, solitary, dioecious palm. Trunk 3.5 – 10 m
tall, 8 – 15 cm diam., internodes 4 – 11 cm, bark brown,
wood soft, base of the crown bulbous, c. 11 cm across.
Leaves 8 – 15 in the crown, porrect to pendulous,
arching, marcescent, occasionally trapping litter; sheath
50 – 90 × 10 – 15 cm, yellowish but covered with brown
blackish indumentum, margins disintegrating and
fibrous; petiole 30 – 150 cm long, 3.5 – 3.8 × 1.5 –
2 cm in cross section, slightly channelled, margins sharp,
abaxial surface covered in caducous white to greyish
tomentum; rachis 2 – 3.50 m long, 1.2 – 2 × 2.2 – 2.6 cm
in cross section in mid-leaf, keeled, pale green, with
irregular grey to brown tomentum, becoming glabrescent; leaflets stiff, regularly arranged, arranged in one
plane, dark green, 46 – 55 on each side of the rachis, the
proximal leaflets 52 – 123 × 0.8 – 2 cm, the median
leaflets 116 – 124 × 4.8 – 6 cm, the distal leaflets 21 – 42
× 0.8 – 2.9 cm, leaflets spaced 4 – 6 cm apart, abaxial
surface with scattered brown scales and ramenta.
Inflorescences interfoliar, solitary. Staminate inflorescence
pendulous, branched to 2 orders, peduncle 24 – 38 cm
long, 0.8 – 1 cm wide, prophyll not seen, peduncular
bracts several but only 2 preserved, c. 77 and 82 cm long,
c. 9 cm wide, purplish, covered in red brown tomentum,
rachis c. 48 cm long; rachillae 9 – 15 cm long, c. 0.5 mm
wide; pedicel 0.6 – 1.2 mm. Staminate flowers yellow, calyx
connate for c. 0.4 mm, lobes 1.6 – 2 × 0.8 – 1 mm; petals
free, 6.2 – 6.5 × 4.5 – 4.7 mm, with scattered minute red
dots near the apex; stamens (6) 12, 2 opposite each
petal, and 2 opposite each sepal, filaments 0.4 – 0.8 mm,
anthers c. 3.5 × 1.4 mm., pistillode minute. Pistillate
inflorescence erect, branched to 1 order, peduncle 19 –
25 cm long, c. 1.6 cm across, yellowish, covered with red
brown tomentum; prophyll c. 30 × 8 cm, pinkish,
covered with red brown tomentum; peduncular bracts
c. 85 × 6 cm, ± equal in size, purplish-pink, abaxial
surface densely covered in red brown tomentum in the
upper part; rachis 30 – 35 × 1.5 – 1.7 cm, yellow but
sparsely to densely covered with red brown tomentum,
with 6 – 18 rachillae; rachillae 35 – 48 cm long,
glabrescent, sinuous, pedicels 3.7 – 5.2 mm long.
Pistillate flowers yellow, sepals connate for c. 1.6 mm,
lobes c. 0.8 × 0.7 mm; petals unequal, spathulate,
coriaceous, 1.3 – 6.5 × 4.5 – 5.4 mm; staminodes 12,
minute; gynoecium c. 7.4 × 8 mm, gibbous, triloculate, stigmas recurved. Fruits blackish, subglobose,
perianth persistent, stigmatic remains apical, 1.4 –
1.6 × 1.5 – 1.6 cm, epicarp c. 0.8 mm thick, mesocarp
1.8 mm thick, spongy, endocarp spongy. Seeds 3; 1.3 –
1.4 × 0.7 – 0.8 mm, seedcoat black, 0.1 mm thick;
endosperm homogeneous. Fig. 13.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
KEW BULLETIN VOL. 65(2)
DISTRIBUTION. Known only from Vondrozo forest, in
southeast Madagascar.
SPECIMENS EXAMINED. MADAGASCAR. Fianarantsoa,
Vondrozo, Madiorano, 22°47 ′39 ″S, 47°11 ′18 ″E, 6 Oct.
2006, M. Rakotoarinivo 317 (holotype K!; isotype TAN!)
& M. Rakotoarinivo 321 (K!, TAN!).
HABITAT. Common in lowland humid forest, in valleys
and swampy areas; 600 – 650 m.
CONSERVATION STATUS. Critically Endangered [CR
(B2a+b(iii); D)]. Known only from one population in
Vondrozo, where it is restricted to frequently flooded
areas. In an Extent of Ocurrence estimated to be less
than 7 km2, only about 40 mature individuals have
been recorded in the field. The forest of Vondrozo is
managed by the local community but logging
operations still occur.
NOTES. Similar to Ravenea robustior and R. krociana in
having solitary inflorescences whether in male or
female plants but differing from these in the lack of
a ventricose trunk, a more delicate inflorescence, with
pendulous rachillae, and having staminate flowers
with usually 12 stamens rather than six. The presence
of three seeds in the fruit is also rather unusual. The
specific epithet honours Henk Beentje, monographer
of Ravenea and co-author of Palms of Madagascar.
2. Ravenea hypoleuca Rakotoarin. & J. Dransf. sp. nov.
R. albicanti (Jum.) Beentje affinis sed vagina folii
indumento non striato et inflorescentia in 2 ordines
ramificanti differt. Typus: Madagascar, Fianarantsoa,
Vondrozo, Madiorano, Rakotoarinivo 315 (holotypus
K!; isotypus TAN!).
http://www.ipni.org/urn:lsid:ipni.org:names:77105558-1
Medium-sized solitary, dioecious palm. Trunk 6 –
10 m tall, 15 – 20 cm diam., blackish brown, covered
in sheath remnants in the upper part, c. 25 cm in
cross section. Leaves 16 – 20 in the crown, porrect,
marcescent, litter-trapping; sheath 60 – 110 × 10 –
15 cm, pale green, covered in thick white tomentum,
margins disintegrating and fibrous; petiole 80 –
150 cm long, 3.5 – 4 × 1.5 – 2.5 cm in cross section,
deeply channelled, margins sharp, covered in white
to greyish tomentum; rachis 3.5 – 4 m long, in midleaf 2.5 – 2.8 × 1.8 – 2.3 cm in cross section, pale
green, covered in thick white tomentum especially on
the abaxial surface, keeled on the adaxial surface;
leaflets stiff, regularly arranged in one plane, dark
green, 52 – 58 on each side of the rachis, proximal
leaflets 62 – 85 × 1.5 – 2.8 cm, median leaflets 102 –
116 × 2.4 – 2.8 cm, distal leaflets 16 – 37 × 1.2 – 2 cm,
leaflets spaced 4 – 6 cm apart, abaxial surface with
continuous white tomentum, transverse veinlets sinuous. Inflorescences interfoliar, solitary. Staminate inflorescence erect, branched to 2 orders; peduncle 24 –
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
301
Fig. 13. Ravenea beentjei A mid-leaflets; B leaf sheath; C female inflorescence with peduncular bract; D female flowers, on rachilla;
E female flower; F male flower; G fruit. A – E and G from M. Rakotoarinivo 321, F from M. Rakotoarinivo 317. Scale bar: A, C =
8 cm, B = 4 cm, D, G = 1 cm, E = 7 mm, F = 5 mm. DRAWN BY LUCY T. SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
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Fig. 14. Ravenea hypoleucca. A apical leaflets; B basal leaflets; C petiole; D male inflorescence; E female inflorescence; F seedling.
A – D from M. Rakotoarinivo 315, E – F from M. Rakotoarinivo et al. 353. Scale bar: A, B, C, F = 6 cm; D, E = 8 cm. DRAWN BY LUCY T.
SMITH.
© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010
NEW SPECIES OF DYPSIS AND RAVENEA (ARECACEAE) FROM MADAGASCAR
30 cm long, c. 1.5 – 3 cm in cross section, prophyll
not seen, peduncular bracts c. 73 cm long, c. 14 cm
wide, purplish, covered in thick white tomentum;
rachis c. 48 cm long; rachillae 12 – 20 cm long,
c. 2 mm in cross section; pedicel 0.6 – 1.2 mm.
Flowers not seen. Pistillate inflorescence interfoliar,
solitary, erect, branched to 1 order, 20 – 30 cm long,
c. 2.4 cm in cross section; prophyll and peduncular
bracts not seen; rachis 10 – 17 cm long; first order
branches 18 – 22; rachillae 28 – 42 cm long, up to
1 cm in cross section at the base; pedicel 3 – 5 mm
high. Flowers not seen. Fruits not seen. Fig. 14.
DISTRIBUTION. Known only from Vondrozo forest,
southeast Madagascar.
SPECIMENS EXAMINED. MADAGASCAR. Fianarantsoa,
Vondrozo, Madiorano, 22°47 ′42 ″S, 47°11 ′30 ″E, 22 Oct.
2006, M. Rakotoarinivo 315 (holotype K!; isotype
TAN!); idem 22°48 ′08 ″S, 47°10 ′52 ″E, 4 Sept. 2009,
M. Rakotoarinivo et al. 353 (K! TAN!).
HABITAT. Lowland humid forest, valley bottoms or
lower slopes; 550 – 600 m.
CONSERVATION STATUS. Critically Endangered [CR
(B2a+b(iii); D)]. Rare species, known only from
Vondrozo where fewer than 20 mature individuals
have been seen in an Extent of Occurrence of 6.7 km2.
Current threats are mostly related to habitat loss and
degradation due to timber extraction.
NOTES. Initially this was confused with Ravenea albicans
because of the strongly discolorous leaflets but it differs
in the presence of continuous brown scales on the leaf
rachis, rather than striped and discontinuous, and the
inflorescence branched to 2 orders in the staminate
plants. Based on incomplete material, the palm is
nevertheless distinct and should be searched for in good
fertile state and also elsewhere. The species epithet
reflects the discolorous leaflets.
Acknowledgements
The authors wish to thank the following researchers
who collected palms in Madagascar and shared their
samples with the Kew Herbarium: Anja Byg, Jeremie L.
303
Razafitsalama and Laurent Gautier. Special thanks to
William J. Baker for his continuous encouragement, to
Lucy Smith for having drawn all the plates of these
new species and to Soraya Villalba for helping in the
preparation of digital versions of the plates. We thank
two anonymous reviewers for their constructive
criticism.
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© The Board of Trustees of the Royal Botanic Gardens, Kew, 2010