KEY TO THE FAMILIES AND GENERA 



131 



Subtribe 12. Geonomes. 



A. Base of the ovary included in the disk. 



B. Anthers arrow-shaped 80. Calyptro- 



[gyne, 

 BB. Anthers with long separate pendulous cells. .81. Geonoma. 

 AA. Disk 0: many-stemmed palms of India 82. Bentinckia, 



Imperfectly Known Genera of Palms. 



S3. Balaka is a member of the Areca Tribe and probably belongs 

 between Ptychospernia and Drymophlceus, differing from those 

 genera as indicated in the article Balaka. 



84. Bismiirckia is a member of the Borassus Tribe. 



85. C'hrysalidocarpus is a well-known member of the Areca 

 Tribe of doubtful affinity. 



86. Exorrhiza is a member of the Areca Tribe, Subtribe Euare- 

 cese. 



87. A'lpa is a member of the Areca Tribe but of uncertain 

 affinity. Its nearest horticultural relative is Phoenix. 



88. Phytelephas is a well-known member of the Areca Tribe 

 but of doubtful affinity. 



89. Pseuduphc^nix is a member of the Areca Tribe which proba- 

 bly belongs in the Subtribe Chamtedorese, near Hyophorbe. 



90. Flychoraphis is a member of the Areca Tribe which probably 

 comes after Ptychosperma. 



91. Ra7ievca is known only in the juvenile state and is con- 

 jectured to be near to Hyophorbe. 



The followiiig genera are also treated: Acoelorraphe, Cypho- 

 kentia, Desmoncus, Eremospatha, Hyospathe, Manicaria, Met- 

 roxylon, Microphoenix, Neonicholsonia, CEnocarpus, Pigafetta, 

 Plychococrus, Pynechanthus, Teysmannia, Welfia and Zalacca. 



199. LEMNACE.£. 



Floating plants with roots: fls. inserted on mar- 

 ginal cracks of the frond; stamens 1-2; anthers 

 2-celled Lemna. 



200. PANDANACE^. 



A. Ovules solitar>' in carpels 1. Pandanus. 



AA. Ovules many in the loculea 2. Freycinetia. 



201. CYCLANTHACE^. 



A. Plants with watery juice 1. Carludovica. 



AA. Plants with milky j nice 2. Cyclanthus. 



202. TYPHACE^. 



The only genus Typha. 



203. ARACE.£. 



. Perianth (except female fls. of Peltandra). 

 B. Fls. monoecious {in Arisaema sometimes 

 diceeious). 

 c. Spadix appendaged (except in Pistea). 

 D. The male and female infi. contiguous 

 with no neutral organs between: 

 ovules anatropous or semi-anatropous 1. Amorpho- 

 DD. The upper fls. males, lower ones {phallus. 

 females: ovules orthotropous. 

 E. The spadix free from the spathe or 

 adnate at the base. 

 p. Male fls. sparse: Ivs. and fls. appear 

 together. 

 G. Tube of spathe with connate 

 margins; male fls. with 1 sta- 

 men ; anthers horseshoe- 

 shaped 2. Arisarum. 



QQ. Tube of spathe convolute; fls. 

 usually dioecious; males with 



2-5 stamens. 3. Artsccma. 



PP. Male fls. dense: Ivs. often appear 

 before fls. 

 G. Tube of spathe with connate 

 margins. 



H. Ovule solitary: Ivs. entire 4. Biarum. 



HH. Ovules 2-4: Iv.i. pedatisect.. . . 5. Sauroma- 

 GO. Tube of spathe convolute. Itum. 



H. Ovules oo, parietal, in 2 series. 6. Arum. 

 HH. 0\'ules few. inserted at base 

 and apex of cell. 

 I. Male and female fls. remote; 



appendix of spadix hairy. . 7. Helicodic- 

 n. Male and female fls. con- [eros. 



tiguous 8. Dracunculu9, 



££. The spadix not appendaged, adnate 



to spathe on back: aquatic plant. . . 9. Piatia. 



EEE. The tube of spathe closed at 

 mouth by dilation of spadix or else 

 divided into 2 cells. 



F. Tube closed at throat 10. Pinellia. 



FF. Tube 2-celled 11. Ambrosinia. 



cc. Spadix not appendaged (rarely with a 

 naked appendage or endowed with 

 neutral organs) ; upper fls. males, lower 

 ones females. 

 D. Stamens connate in a prismatic or pel- 

 tate body. 

 E. Plants are climbing shrubs. 



F. Ovaries distinct, 2-10-cened 12. Philoden- 



\dTon, 



FF. Ovaries coherent, 1-2-celled 13. Syngonium, 



EE. Plants are herbs, not climbing 



F. The ovules orthotropous or nearly 

 so;micropyle superior. 

 G. Ovules numerous in 2 series on 



3-5 parietal placenta 14. Colocasia. 



GG. Ovules few, basal 15. Alocaaia. 



GGG. Ovules 1 or few, subparie- 

 tal : distinguished by ovary 

 immersed in a carp and em- 

 bryo not albuminous 16. Peltandra. 



FF. The ovules anatropous or semi- 

 anatropous; micropyle inferior. 

 Q. Ovaries distinct or slightly 



coherent 17. Caladium. 



GG. Ovaries distinct below, above 

 thick, dilated and grown 



together 18. Xanthosoma, 



GGG. Ovary 2-5-celled 19. DieffeJi- 



DD. Stamens distinct. [bachia, 



E. Fr. not included by tube of spathe; 

 the whole spathe deciduous, mar- 

 cescent. 

 P. Ovule affixed to intruded placentae: 



Ivs. ovate 20. Aglaonema. 



FF. Ovule affixed near top of cell: 



Ivs. broadly arrow-shaped 21. Nephthytis. 



EE. Fr. included by accrescent lube of 

 spathe : blade of spathe marces- 



cent. deciduous 22. Zantedes- 



EEE. Fr. included by spathe, blade of [chia, 



which is persistent 23. Homalo- 



EEEE. Fr. girt by the top-shaped tube of [mena, 



spathe, which has a circumscissile, 



deciduous blade 24. Schismato- 



BB. Fls. hermaphrodite. [glottis, 



c. Plants marsh herbs 25, Calla. 



cc. Plants are scandent shrubs. 



D. Ovules 2 in a cell, affixed to base of 



septum 26. Monstera. 



DD. Ovules solitary, basal 27. Scindapsus. 



DDD. 0\'ules numerous 28. Rhaphid~ 



[ophora, 



DDDD, 0\'ules 3 or 4 in a cell 29. Stenosper- 



AA. Perianth of 4-8 distinct segms. ; fls. att her- [mutium. 



maphrodite. 

 B. Spadix flowering downward; spathe long, 



often twisted, long -persistent 30. Cyrtosperma» 



BB. Spadix flowering upward. 



c. Spathe sheathing the very long peduncuU- 

 form stipe of the spadix, with blade in- 

 complete or 0. 

 D. Ovary 1-celled; ovules solitary, semi- 



anatropous 31. Orontium. 



DD. Ovary 2-celled; ovules 1-2 in a cell, 



orthotropous 32. Lysichitum, 



DDD. Ovary 1-2-celled; ovule 1 in each cell, 



suspended 33. Symplo- 



DDDD. Ovary imperfectly 1-2-ceUed; ovule [carpus. 



solitary, affixed to interior angle of 



cell 34. Dracontium. 



cc. Spathe provided with scale-like appen- 

 dages in the tube, long-persistent : 

 ovules semi -anatropous or campylo- 



tropous 35. Spathyema. 



ccc. Spathe leafy, accrescent, persistent, quite 



flattened out: ovules anatropous 36. Spathiphyl- 



cccc. Spathe open, recur\'ed or reflexed, aceres- [lum. 



cent, persistent: o\'ules various 37. Anthurium. 



ccccc. Spathe accrescent, persistent or obsolete: 



ovules anatropous 38. Poihos. 



cccccc. Spathe obsolete or obscure: ovules ortho- 

 tropous 39. AcoTUB. 



Additional Key to the Araceae. 



The Araceae are likely to be so difficult for the gardener that an 

 additional key, ba.sed on other contrasts, is here in.serted for his 

 convenience. 



A. Plants free-swimming, aquatic. . . ._. Piatia. 



AA. Plants not free-swimming aquatics, terres- 

 trial or marsh plants. 

 B. Lvs. parallel- veined (see also Calla and 

 Acorus). 

 c. Plant shrub-like or climbing: st. more or 

 less aerial: stamens of staminate 6. 

 separate. 



