KEY TO GENERA OF PHILIPPINE PALMS 
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8. Flowers in two or three rows on the primary branches 
of the once-branched inflorescence; sylvan species. 
21. Pinanga. 
8. Flowers spirally arranged on the branches; fruits large. 
4. Inflorescences axillary. 
1. Actinorhytis. 
5. Leaf-sheaths with coarse, black fibers, the leaflets usually lobed 
and usually auricled at the base, whitish beneath. 
5. Not as above. 
6. Petioles spiny. 
4. Arenga. 
7. Fruits in dense head; the oil palm, cultivated only. 
7. Inflorescences lax. 
6. Petioles unarmed. 
10. EHlaeis. 
20. Phoenix. 
7. Fruits large, 15 to 30 centimeters in diameter; the coco- 
nut palm, cultivated. 
7. Cocos. 
7. Fruits smaller, never exceeding 10 centimeters in diameter. 
8. Fruits 5 to 8 centimeters in diameter. 
18. Orania. 
8. Fruits less than 1 centimeter in diameter. 
9. Fruits globose. 
9. Fruits more or less ovoid. 
11. Heterospathe. 
23. Ptychoraphis. 
LIST OF SPECIES 
All of the palms known to be natives of, or naturalized in, 
the Philippine Islands are given in the following list. 
Actinorhytis calapparia Wendl. 
Drude. 
Adonidia merrill Becc. 
Areca caliso Becc. 
Areca camarinensis Bece. 
Areca catechu L. Betel palm. 
Areca catechu var. batanensis Becc. 
Areca catechu var. longicarpa Becc. 
Areca catechu var. silvatica Becc. 
Areca costulata Bece. 
Areca hutchinsoniana Bece. 
Areca ipot Bece. 
Areca ipot var. polillensis Bece. 
Areca macrocarpa Bece. 
Areca parens Becc. 
Areca vidaliana Becc. 
Areca whitfordii Bece. 
Areca whitfordii var. 
Becc. 
Arenga ambong Bece. 
Arenga pinnata (Wurmb) 
Kaong or sugar palm. 
Arenga tremula (mindorensis ) 
(Blanco) Bece. 
Calamus arugda Becce. 
Calamus bicolor Bece. 
Calamus blancoi Kunth. 
luzonensis 
Merr. 

et | Calamus cumingianus Bece. 
Calamus diepenhorstii var. exulans 
Becce. 
Calamus dimorphacanthus Becc. 
Calamus dimorphacanthus var. mon- 
talbanicus Becc. 
Calamus dimorphacanthus var. zam- 
balensis Bece. 
Calamus discolor Mart. 
Calamus. discolor var. 
Becc. 
Calamus elmerianus Becc. 
Calamus filispadix Becc. 
Calamus foxworthyi Becce. 
Calamus grandifolius Becc. 
Calamus halconensis Becc. 
Calamus jenningsianus Bece. 
Calamus manillensis H. Wendl. 
Calamus maximus (merrillii) Blanco 
(forma typica). 
Calamus maximus var. merrittianus 
Bece. 
Calamus maximus var. nanga Becc. 
Calamus megaphyllus Becc. 
Calamus melanorhynchus Bece. 
Calamus meyenianus Schauer. 
Calamus microcarpus Bece. 
negrosensis 
