KEY TO THE FAMILIES AND GENERA 



129 



F. Cy™^3 fascicle-formed, with the 

 very short rachia contracted 

 into a receptacle, sessile inside 

 the base of the complicate floral 



Ivs. or variously paniculate 8. Trades- 



FF. Cyme terminal, pedunculate with [cantia* 



2-3 longish branches secund-fld. 



from base 9. Tinantia. 



EE. Ovary cells l-ov-uled 10. lihaeo. 



197. JUNCACE^. 



A. Ovary l-celled. or more or less perfectly 3- 



celled; placentae or cells co-ovuled 1. J uncus. 



A.K. Ovary 3-celled; cells 2- or few-ovxiled 2. Prionium. 



198. PALMACE^. 



A. Lf.-segms. infolded in vernation: 

 spadices interfoliaceous. 

 B. Fls. dicecious. 



c. Lvs. pinnatiaect; segms. acumi- 

 nate: spat he solitary; ovary of 3 

 distinct carpels, only 1 maturing: 

 seed deeply grooved ventrally 



umbihcate, embryo dorsal 1. Phcenix Tribe. 



CC. Lvs. plaited in a fan-shaped fash- 

 ion, roundish, semi-orbicular or 

 wedge-shaped, spUt : spathes 

 numerous; ovary entire or 3- 

 lobed, 3-ceIled, with erect ovules: 

 seeds with a mere dot of a hilum: 



raphe ventral 2. Corypha Tribe. 



BB. Fls. usually hermaphrodite: lvs. 

 much like those of Corypha Tribe: 

 spathes numerous; ovary entire, 

 3-Iobed, with ascending ovules: 



seeds with diffused hilum 3. Borasscs Tribe, 



AA. Lf.-segms. folded back in vernation. 

 B. Seeds adherent to the endocarp; 

 hilum diffused; embryo opposite 

 pore: spadices interfoliaceous; fls. 

 usually monoecious in the same 

 spadix, the lower ones in 3's with 



the middle one pistillate 4. Cocos Tribe. 



BB. Seed umbilicate. 



c. Raphe dorsal; embryo ventral: 

 spadices terminal or axillary; 

 fls. polygamo-moncecious 5 



CC. Raphe ventral; embryo dorsal. . . . 

 1. Phoenix Tribe. 



Lepidocarva 



(Tribe. 

 Areca Tribe. 



The only genus 1. Phcenix. 



2. Corypha Tribe. 



A. Style or stigma basilar in fr.: endosperm 

 equable. 

 B. The style short ; embryo terminal. Palms 



fruit once and die 2. Corypha. 



BB. The style elongated. 



c. Embryo dorsal 3. Sabal 



[{Inodes). 



CC. Embryo sub-basilar 4. Washing- 



LA. Style or stigma terminal in fruit. \ionia. 



B. Perianth of imbricate petals or corolla- 

 segms. 

 c. Fls. polygamo-dicecious; stigmas sessile, 

 distinct; embryo dorsal. 



D. Endosperm ruminate 5. Cham^rops. 



DD. Endosperm equable 6. Rhapido- 



CC. Fls. hermaphrodite; styles long, distinct. [phyllum. 



D. Filaments free 7. Acantho- 



[rhiza. 



DD. Filaments connate into a tube 8. Trithrinax. 



BB. Perianth of valvale petals or corolla-lobes 

 (see also bbb). 

 c. Fls. dioecious; corolla 3-toothed; anthers 



extrorseiy dehiscent 9. Rhapis. 



CC. Fls. polygamo-moncecious; carpels dis- 

 tinct; stigmas distinct, sessile: endo- 

 sperm equable, ventrally grooved; 



embryo dorsal 10. Trachy- 



CCC. Fls. hermaphrodite. [carpus. 



D. Embryo dorsal; I endosperm equable: 

 carpels slightly cohering or in 

 Livistona sometimes distinct. 

 E. Spadix-branches not sheathed style 



single, short, 3-cornered 11. Brahea. 



EE. Spadix rachis sheathed; carpels 3- 



comered; style single, thread-like. .12. Licuala. 

 EEE. Spadix-branches naked or lower ones 

 bracted ; carpels globose; styles 



short, distinct or cohering 13. Liviaiona. 



DD. Embryo, sub-basilar: rachis of spadix 

 sheathed. 



9 



E. Endosperm ruminate: carpels 3, dis- 

 tinct at base; style single, short, 



3-grooved 14. Copernicia. 



BE. Endosperm equable. 



F. Corolla-tube persistent; segms. 

 deciduous; ovary 3-cornered or 

 3 lobed, narrowed into a style . . 15. Pritckardia. 

 PF. Corolla otherwise. 



G. Carpels free at base; style sin- 

 gle, slender, elongated 16. Serenaea. 



QQ. CarpeU slightly cohering; style 



single, short, 3-grooved 17. Erythea. 



BBB. Perianth minute 6-fid or obsolete 18. r/irtnaj-(and 



Coccothrinax). 



3. Borassus Tribe. 



A. Stamens 6. 



B. Fls. numerous in the cavities of the spadix. . .19. Borassua. 



BB. Fls. solitary in the cavities 20. Hyphaene. 



AA. Stamens numerous. 



B. Fls. numerous in cavities 21. Lodoicea. 



BB. Fls. solitary in cavities 22. Latania. 



4. Cocos Tribe. 



A. Palms armed with prickles: fr. 1-aeeded; 

 endocarp 3-porous at or above the middle. 

 B. Pistillate fls. with petals united for a con- 

 siderable distance; staminate fls. smaller: 

 endocarp bony. 

 c. Staminate fls. not immersed in spadix: lf.- 

 segms. acuminate 23. Bactris. 



CO. Staminate fls. immersed in cavities of 



spadix: lf.-segms. premorse 24. AatTo- 



BB. Pistillate fls. with petals connate only at [car^um. 



base. 

 c. Staminate fls. immersed; anthers large, 



inserted: lf.-segms. acuminate 25. Acrocomia^ 



CC. Staminate fls. not immersed; anthers 

 included: lf.-segms. wedge-shaped, 



premorse 26. Martinezia. 



AA. Palms unarmed. 



B. Endocarp 3-porous above middle: fr. 



1-3-seeded 27. Elaeis. 



BB. Endocarp bony and, except in Jubaea, 3-6- 

 porous toward base: fr. l-t»-seeded. 



c. Spadix simple 28. Diplothe' 



CC. Spadix simply branched. [mium. 



D. Number of stamens 6: fr. 1-seeded (in 

 Scheelea sometimes 2-3-seeded). 

 E. Petals minute, much smaller than 



exserted stamensof staminate fls. ..29. Maxi- 



[miliana 

 EE. Petals lanceolate; stamens included. .30. Cocoa. 

 EEE. Petals shaped hke a long club, or 



cylindrical; stamens shorter 31. Scheelea, 



DD. Number of stamens 10-24 or more; 

 petals of staminate fls. lanceolate; 

 stamens included; anther-cells con- 

 nate. 



E. Fr. 2-6-seeded 32. AUaleaJ 



EE. Fr. 1-seeded; the endocarp 3-porou3 



at th« middle oraHttle lower 33. Jubaea. 



5. Lepidocarya Tribe. 



A. Lvs. fan-shaped: ovary perfectly 3-celled 34. Mauritia. 



AA. Lvs. equally pinnatisect: ovary imperfectly 

 3-celled; spadices axillap'. 



B. Palms fruit once and die 35. Plectocomia 



BB. Palms fruit more than once; usually 

 climbers, 

 c. Spathes sohtary, deciduous: lf.-segms. 



rhombic; nerves fan-shaped 36. Ceratolobua. 



CC. Spathes numerous, persistent: lf.-segms. 



acuminate; nerves parallel. 



D. Spadices contracted ; spathes cymbi- 



form, beaked, long-persistent, the 2 



lower ones forming an involucre for 



the others 37. Daemono- 



DD. Spadices diffu.sed. or, if contracted, the [ropa. 



spathes are flat and persistent only 

 during anthesis 38. Calamua, 



6. Areca Tribe. 



Key to Subtribes; 



A. Petals of the pistillate fls. valvate 

 throughout nearly their whole length; 

 spadices interfoliaceous; spathes 2 or 



more; ovary entire, 3-celled 1. Cabtotidea. 



AA. Petals of the pistillate fls. overlapping 

 or valvate only at apex, very rarely 

 valvate throughout. 

 B. Spadices infrafoliaceous. 



c. Stigmas terminal in fr.; ovary 

 entire, l-celled. 

 D. Staminate fls. unsymmetrical; 

 sepals usually small and not 

 imbricate 2. Euarecea. 



