176 The Philippine Journal of Science mn 



d 1 . Leaves and buds hairy 6. D. vernicifluus. 



d 1 . Leaves and buds glabrous or nearly so. 



e\ Fruit 9 to 13 mm in diameter, short wings of fruit not ex- 

 panded or refiexed 7. D. subalpinns. 



e'. Fruit 1 to 2 cm in diameter, short wings of fruit usually 



expanded or refiexed 5. D. hasseltii. 



c % . Fruit more than 2 cm in diameter. 

 d l . Fruit obconical or top-shaped. 



e\ Leaves pubescent 10. D. obconicus. 



e'. Leaves and buds glabrous. 



f 1 . Leaf-base rounded 9. D. perturbinatua. 



f. Leaf-base cuneate 11. D. cuneatua. 



d*. Fruit globose. 

 e\ Leaves and young shoots brown-hairy. 



f. Leaves long and narrow, membranaceous or chartaceous. 



2. D, affinis. 



f. Leaves broader, usually coriaceous 1. D. pilosus. 



e*. Leaves and young shoots not brown hairy. 



f 1 . Secondary nerves 10 to 12 pairs 4. D. gracilis. 



f. Secondary nerves 16 to 20 pairs 3. D. trinervia. 



a*. Fruit round at base with 5 rounded tubercles or shoulders above 



(§ Tuberculati Dyer) 12. J), warburgn. 



a*. Fruit 5-angled or 5-winged (§§ Angulati and Alati). 



V. Leaves orbicular 17. D orbicularie. 



b'. Leaves not orbicular. 

 c\ Fruit very heavy and woody, 3 cm or more in diameter. 



13. D. 8pecioaus. 

 c 1 . Fruit not as above. 



<f. Leaves glabrous, fruit membranous-winged.. 15. D. grandiflorus. 

 d*. Leaves pubescent. 

 e\ Leaves 6 to 11 cm long; wings or ridges woody. 



14. D. basilanicus. 

 e*. Leaves larger; fruit with membranaceous wings. 



16. £>. philippinensis. 

 %, DIPTEROCARPUS PILOSUS Roxb. Hagackac. 



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.), hagackac 



(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. 



