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The Philippine Journal of Science 
191 S 
d 1 . Leaves and buds hairy 6. D. vernicifluus. 
<T. Leaves and buds glabrous or nearly so. 
e 1 . Fruit 9 to 13 mm in diameter, short wings of fruit not ex- 
panded or reflexed 7. D. subalpinus. 
e 3 . Fruit 1 to 2 cm in diameter, short wings of fruit usually 
expanded or reflexed 5. D. hasseltii. 
<?. Fruit more than 2 cm in diameter. 
d 1 . Fruit obconical or top-shaped. 
e 1 . Leaves pubescent .. 10. D. obconicus. 
e'\ Leaves and buds glabrous. 
f. Leaf-base rounded 9. D. perturbinatus. 
f. Leaf-base cuneate 11. D. cuneatus. 
d 2 . Fruit globose. 
e 1 . Leaves and young shoots brown-hairy. 
f 1 . Leaves long and narrow, membranaceous or chartaceous. 
2. D. affinis. 
p. Leaves broader, usually coriaceous 1. D. pilosus. 
e ’. Leaves and young shoots not brown hairy. 
f. Secondary nerves 10 to 12 pairs 4. D. gracilis. 
f\ Secondary nerves 16 to 20 pairs 3. D. trinervis. 
a 2 . Fruit round at base with 5 rounded tubercles or shoulders above 
(§ Tuberculati Dyer) .. 12. JD. warburgii. 
a 3 . Fruit 5-angled or 5-winged (§§ Angulati and Alati). 
b l . Leaves orbicular 17. D. orbicularis. 
b‘. Leaves not orbicular. 
c 1 . Fruit very heavy and woody, 3 cm or more in diameter. 
13. D. speciosus. 
c 2 . Fruit not as above. 
d. Leaves glabrous, fruit membranous-winged.. 15. D. grandiflorus. 
dr. Leaves pubescent. 
e 1 . Leaves 6 to 11 cm long; wings or ridges woody. 
14. D. basilanicus. 
e 2 . Leaves larger; fruit with membranaceous wings. 
16. D. philippinensis. 
1. DIPTEROCARPUS PILOSUS Roxb. Hagachac. 
This form is often found making up a large part of the stand in lowland 
forests in regions with relatively even rainfall. Its known distribution in 
the Philippines is: 
Luzon: Cagayan, Nueva Ecija, Rizal (?),Tayabas, Camarines. Polillo. 
Marinduque. Mindoro. Samar. Leyte. Negros (?). Mindanao: Bu- 
tuan, Davao, Zamboanga. 
2. DIPTEROCARPUS AFFINIS Brandis. Camuyao (Cag.), hagachac 
(Tag.), liput (Manobo). 
This species is very much like the last and seems to have a more re- 
stricted range. 
Luzon: Cagayan, Tayabas, Camarines. Ticao. Mindanao: Agusan, 
Zamboanga. 
3. DIPTEROCARPUS TRINERVIS Blume. Apitong (Palawan). 
Palawan. The species is not known from any other locality in the 
Philippines. 
