Aug. 25, 1919] 



Palms of the Philippine Islands 



30G5 



Key to the genera. * 



f 



1. Leaves bipinnate or decompound. 1. Caryota. 



1. Leaves orbicular, their segmented portions free or 

 plicately united. 

 2. Monocarpic palms with dull or grayish green leaves; 

 inflorescences terminal. 2. Corypha. 



2. Polycarpic palms with bright green leaves; inflores- 

 cences axillary. 

 3. Blades divided into radiating segmented portions, 

 which are praemorse at their tips. 3. Licuala. 



3. Blades plicately united, except the free apical 

 segments which are not praemorse. 4. Livistona. 



1. Leaves pinnate or compound. 

 2. Climbing palms with flagellae, the leaf rachis be- 

 neath with recurved claws. 

 3. Leaflets rhomboid or wedge shaped; leaf sheaths 

 usually inflated and inhabited by ants- 5. Korthalsia. 

 3. Leaflets never rhomboid nor wedge shaped; leaf 

 sheaths not inflated nor inhabited by ants. 

 4. Monocarpic palms; the elongated and drooping 

 branches of the inflorescence with broad overlap- 

 ping bracts concealing the flowers. 6. Pkctocomia. 

 4. Polycarpic p;ilms; branches of the inflorescence 

 relatively short, not drooping nor with broad 

 flower concealing bracts. 



5. Spikes in the axils of large, open and decid- 

 uous spathels, leaving annular vestiges after 

 falling; flagellum always from the end of the 

 rachis. 7. Daenwnorops. 



5. Spikes in the axils of tubular or funnel shaped 

 and persistent spathels; flagellum from the 

 end of the leaf rachis or from the leaf sheath. 



8. Calamus. 



2. Palms with stems or acaulescent, never flagellate 



nor the leaf rachis clawed. 



3. Fruits scale covered. 



9. Zalacca. 



4. Acaulescent palms. 

 4. Caulescent palms. 

 5. Monocarpic trees 



tescence. 

 5. Polycarpic trees 

 tescence. 



with erect terminal infru- 



10. Metroxylon. 



with axillary recurved infru- 



* This key, prepared by A. D E. Elmer, is based mainly on vegetatiye 

 characters including a few habitats. A dozen additional introduced genera have 

 been omitted, because they have not yet borne flowers. 



