Revision of Monstera of Central America. Thomas B. Croat P. A. Schulze Curator Missouri Botanical Garden

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1 Revision of Monstera of Central America Thomas B. Croat P. A. Schulze Curator Missouri Botanical Garden

2 Key to sections of Monstera Juvenile plants with leaves long-petiolate and spreading. Pistils mm diam. in fruit; seeds cm diam. sect. Tornelia Pistils 5-8 mm diam.; seeds 5-13 mm diam. sect. Monstera Juvenile plants with shingle leaves, tightly appressed to tree and with short petioles. Flowering spadix erect. sect. Monstera Flowering spadix pendent, adult leaf with ligule about as long as petiole. sect. Echinospadix

3 Monstera last revised by Madison (1977) 22 species, 3 varieties 4 sections Sect. Tornelia 1 sp. Sect. Monstera 13 spp. Sect. Marcgraviopsis 7 spp. Sect. Echinospadix 1 sp. All except 2 of Madison s species were native to Central America. One additional species, M. lechleriana is endemic to South America but reported for Central America based on misdetermined material. Presently there are 94 species Sect. Monstera 28 spp. Sect. Marcgraviopsis 12 spp. Sect. Tornelia 1 sp. Sect Echinospadix 1 sp. Unknown sections 52 spp.

4 Number of Species per Country Mexico Guatemala Belize El Salvador Honduras Nicaragua Costa Rica Panama

5 All Monstera Species in Central America 92 Mexico 11 Guatemala 8 Belize 6 El Salvador 1 Honduras 7 Nicaragua 9 Costa Rica 40 Panama 64 Middle America 47 (All of Central America except Mexico and Panama)

6 Number of Endemic Species per country Mexico Belize Honduras Costa Rica Panama

7 Endemic Species in Central America Mexico Guatemala Belize El Salvador Honduras Nicaragua Costa Rica Panama

8 Characteristics of Monstera Internodes coarse and tough with roots mostly on one side of stem Roots dense, capable of growing into cracks Petioles typically almost fully sheathed Sheath persisting or deciduous Juvenile growth scototropic Juvenile leaves diverse in shape and form Leaf blades highly diverse - Entire - Pinnately lobed - Perforated - Perforated becoming pinnate Major veins sunken and concolorous above, narrowly rounded and paler below Reticulate venation reticulate Inflorescence 1-several per axil Peduncle variation Spathe thick and caducous Pollination by beetles at night Spadix cylindroid Flowers hermaphroditic Stigmas circular or oblong, berries with large seeds

9 Pinnately lobed Perforate in several series Leaf blade diversity Entire blades Partly perforate with ripping out

10 Spathe spadix proportions M. egregia M. tarzuensis M. deliciosa Monstera sp. nov. Boquete M. acuminata

11 Fruit type and dehiscence M. obliqua M. anomala M. acuminata

12 Preparing a working key Blade with reticulate venation Blade with parallel venation

13 Key to Monstera of Central America 1. Adult leaf blades with secondary venation completely reticulate. 2. Petiole sheath persistent. M. membranacea Madison M. florescanoana Croat, Krömer & Acebey 2. Petiolar sheath deciduous. 3. Peduncles longer than the spadix. M. zhuii Croat 3. Peduncles shorter or longer than the spadix. 4. Petioles longer or equal to the length of the midrib of the leaf blade. M. deliciosa Liebm. 4. Petioles shorter than the midrib of the leaf blade. 6. Stems of adult plants more or less flattened laterally M. filamentosa 5. Stems of adult plants subcylindric. 6. Leaf blades regularly M. punctulata (Schott) Schott ex Engl. 6. Leaf blades not regularly pinnatifid. 7. Leaf blades to rounded at base. M. dubia 7. Leaf blades broadly cordate at the base. M. siltepecana 1. Adult leaf blades with secondary venation parallel.

14 Additional Key Characters involving Stems and Petioles 2. Petiole sheath persistent. M. membranacea M. florescanoana 2. Petiolar sheath deciduous. 3. Peduncles longer than the spadix. M. zhuii 3. Peduncles shorter or longer than the spadix. 4. Petioles longer or equal to the length of the midrib of the leaf blade. M. deliciosa 4. Petioles shorter than the midrib of the leaf blade. 5. Stems of adult plants more or less flattened laterally. M. filamentosa 5. Stems of adult plants subcylindric. 6. Leaf blades regularly pinnatifid. M. punctulata 6. Leaf blades not regularly pinnatifid. 7. Leaf blades to rounded at base. M. dubia 7. Leaf blades broadly cordate at the base. M. siltepecana

15 Key Characters of Blade Perforations. 9. Leaf blades regularly pinnatifid (rarely on one side only). 10. Leaf blades lacking perforations. 11. Pinnae pairs; flowering spadix cm diam.; Nicaragua to Panama. M. tenuis 11. Pinnae 4 12 pairs; flowering spadix 1 3 cm diam. 12. Leaf blades broadly cordate at base M. deliciosa 12. Leaf blades truncate to acute at base

16 Additional Key Characters for Monstera- Peduncle & Spadix Proportions 32. Peduncles shorter than the spadix. 33. Leaf blades generally perforate; petiole sheath deciduous or persisting entire. M. barvaensis Croat 34. Spadices with stigmas rounded or subrounded. M. quereteroensis 34. Spadices with stigma oblong. 35. Internodes 5 11 cm long. M. acuminata 35. Internodes short. 33. Leaf blades lacking perforations M. anomala 32. Peduncles longer than the spadix. 34a. Inflorescence with spadix narrow, more than 6 times longer than wide. 35. Petioles asperous-verrucose. M. ortizii, M. moralesii, M. garwoodiae, M. buseyi, M. costaricensis 35. Petioles glabrous and more or less smooth.

17 M. cf. acuminata, Carnevali 6288

18 Monstera acuminata, Diaz 613

19 M. acuminata, Tabasco, vic. Teapa

20 Monstera acuminata

21 M. adansonii var. laniata

22 Monstera anomala

23

24 Monstera bocatorensis, Hammel 14599

25 Monstera copensis

26 Monstera deliciosa

27 Monstera deliciosa, Cult. Honduras

28 Monstera dubia, juvenile leaves, Mexico, Palenque

29 Monstera dubia

30 Monstera donosoenensis

31 Monstera dwyeri Croat

32 Monstera egregia

33 Monstera egregia Schott s Illustration

34

35 Monstera filamentosa, Grayum 8762

36 M. florescanoana T. Kröemer Veracruz (type)

37 Monstera florescanoana

38 Monstera florescanoana

39 Monstera integrifolia

40 Monstera obliqua Cerro Jefe, Ortiz

41 M. obliqua

42 M. pinnatipartita, Monteverde,Costa Rica

43 Monstera pinnatipartita, Croat 82540

44 Monstera punctulata

45 M. punctulata

46 M. spruceana, Croat 74126

47 Monstera standleyana nster

48 Monstera tarrazuensis

49 M. tarrazuensis

50 M. tenuis, Boquete Area, Panama

51 Monstera tiribiensis, Grayum, 3404

52 Monstera tuberculata

53 Monstera with bicolored leaves

54 Panama, Boquete to Santa Clara

55 Monstera alfaroi

56 Monstera allenii

57 Monster alfaroi

58 Monstera alticola

59 Monstera alticola

60

61 Monstera copensis

62 Monstera costaricensis

63 Monstera deliciosa

64 Monstera dilacerata

65 Monstera dissecta

66 Monstera dissecta

67 Monstera donosoensis

68 Monstera donosoensis

69 Monstera dubia

70 Monstera dubia

71 Mostera dubia

72 Monstera dwyeri

73 Monstera egregia

74 Monstera epipremnoides

75 Monstera epipremnoides

76 Monstera diseccta

77 Monstera glaucescens

78 Monstera golfitoensis Croat

79 Monstera golfitoensis Croat

80 Monstera grayumii Croat

81 Monstera hammelii Croat

82 Monstera hammelii Croat

83 Xanthosoma hannonii Croat

84 Monstera hornitioensis Croat

85 Monstera ibaneziae Croat

86 Monstera intregrifolia Zuluaga & Croat

87 Monstera knappiae Croat

88 Monstera lentii Croat & Grayum

89 Monstera lentii Croat & Grayum

90 Monstera luteynii Madison

91

92

93

94

95

96

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