Stylocline citroleum

Morefield

Madroño 39: 125, fig. 4. 1992.

Common names: Oil neststraw
EndemicConservation concern
Treatment appears in FNA Volume 19. Treatment on page 452. Mentioned on page 450, 451.

Plants 2–9 (–13) cm. Leaves broadly acute, mucronate, longest 6–13 mm; largest capitular leaves broadly oblanceolate to ± elliptic, 4–12 × 2–3.5 mm. Heads in dichasiform or proximally ± racemiform arrays, ± spheric, largest 4–5.5 × 3.5–5 mm, thickly lanuginose (dull, indument evident). Phyllaries ± persistent, elliptic to obovate, 1.5–2.5 mm, subequal. Receptacles clavate, 1.5–2.5 mm, heights 4–6 times diams.; scars ± evenly distributed, slightly sunken. Pistillate paleae: longest 2.5–3.5 mm, winged proximally and distally; wings elliptic to slightly obovate (bases acute), widest in median 1/3 of palea lengths; bodies (except midnerves) chartaceous; outermost paleae ± saccate. Functionally staminate florets 3–6; ovaries partially developed, (0.2–) 0.3–0.6 mm; corollas 1–1.6 mm. Cypselae 0.8–1 mm, compressed; pappi: staminate of (5–) 6–12 (–13) barbellate bristles 1.4–1.8 mm (proximal barbs longer, spreading).


Phenology: Flowering and fruiting Mar–Apr.
Habitat: Dry, open, relatively undisturbed, often crusted sandy or clay soils, gentle slopes, dry drainage banks, clearings in saltbush (Atriplex) vegetation
Elevation: 60–300 m

Discussion

Of conservation concern.

Stylocline citroleum is known from western Kern County; basis for an 1883 San Diego County report is likely extirpated or plants were mislabeled. It is fairly widespread on and near the former Elk Hills Naval Petroleum Reserve (D. F. Williams et al. 1998).

Stylocline citroleum almost always occurs with S. gnaphaloides and/or Logfia filaginoides. It is thought to be descended from hybrid ancestors (J. D. Morefield 1992, 1992b) and now appears to be fertile, morphologically uniform, and reproductively isolated from sympatric taxa. Character states place it sister to S. gnaphaloides.

Selected References

None.

Lower Taxa

None.

"broader" is not a number."longest" is not a number.

... more about "Stylocline citroleum"
truncate-penicillate;truncate +
scarious +
mostly ovate +  and lanceovate or linear +
racemiform +, paniculiform +  and corymbiform +
dichasiform +
indeterminate +  and determinate +
James D. Morefield +
Morefield +
decurrent +
compound +  and simple +
oblanceolate;lanceolate +
muriculate +, papillate +  and smooth +
linear-lanceolate;oblanceolate +
0.14 cm1.4 mm <br />0.0014 m <br /> (0.18 cm1.8 mm <br />0.0018 m <br />) +
Oil neststraw +
actinomorphic +
red-tipped +, purplish +, yellow +  and whitish +
0.1 cm1 mm <br />0.001 m <br /> (0.16 cm1.6 mm <br />0.0016 m <br />) +
compressed +
60–300 m +
winged +  and beaked +
dispersed +
Dry, open, relatively undisturbed, often crusted sandy or clay soils, gentle slopes, dry drainage banks, clearings in saltbush (Atriplex) vegetation +
singly +  and aggregated +
indeterminate +
0.4 cm4 mm <br />0.004 m <br /> (0.55 cm5.5 mm <br />0.0055 m <br />) +
lanuginose +
homogamous +  and heterogamous +
spheric +
largest +
0.35 cm3.5 mm <br />0.0035 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
each +  and sessile +
inconspicuous +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
0.2 cm2 mm <br />0.002 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
sessile +  and petiolate +
mucronate;acute +
0.6 cm6 mm <br />0.006 m <br /> (?) +  and 1.3 cm13 mm <br />0.013 m <br /> (?) +
rarely lanceovate +  and lanceolate +
2-carpellate +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.06 cm0.6 mm <br />6.0e-4 m <br />) +
pistillate +  and winged +
erect +  and ascending +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
persistent +
Flowering and fruiting Mar–Apr. +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
paleate +  and epaleate +
4-6 times diams +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.25 cm2.5 mm <br />0.0025 m <br />) +
distributed +
exalbuminous +
Endemic +  and Conservation concern +
ascending +  and more or less prostrate +
2 +  and 10 +
appendaged +  and truncate +
papillate +
Compositae +
Stylocline citroleum +
Stylocline +
species +
10 cm100 mm <br />0.1 m <br /> (20 cm200 mm <br />0.2 m <br />) +
1 cm10 mm <br />0.01 m <br /> (10 cm100 mm <br />0.1 m <br />) +
9 cm90 mm <br />0.09 m <br /> (13 cm130 mm <br />0.13 m <br />) +
elliptic +  and slightly obovate +