Dipterocarpus] XVII. DIPTEROCARPACEiE 65 



1. DIPTEROCARPUS, Gaertn. f. : Fl. Brit. Ind. i. 295. 



Tall, regularly shaped trunks, no heartwood. Leaves are renewed at the end 

 of the hot season, when the old leaves fall. Secondary nerves prominent, 

 straight, joined by parallel tertiary nerves. In bud the two halves of the leaf 

 are folded upon each other and the sections between two secondary nerves are 

 also folded in half. Fl. large, pink, in short few-fid. axillary panicles. 

 Receptacle concave, continued into a campanulate or obconical calyx tube 

 with 5 segments, 2 of which are larger. Stamens x, connective prolonged 

 into a long point, anther cells mostly equal. Ovaiy generally hairy, con- 

 tinued into a conical fleshy stybpodium, style filiform, stigma minute. Tube 

 of fruiting calyx enclosing fruit, but not adnate to it, globose or ovoid, smooth 

 or with 5 ribs or wings, alternating with calyx segments, two of which 

 develop into large longitudinally veined wings. Pericarp thin at the base, 

 thick and fibrous in the upper portion. The cotyledons of the germinating 

 seed remain enclosed in the pericarp and fruiting calyx, being attached to the 

 radicle by long petioles. Species 64. 



Numerous (up to 100) resin ducts in a leaf-bearing internode near the circum- 

 ference of the pith. The lateral leaf traces enter the bark at varying levels, generally 

 in the upper half of the internode. Numerous stipular traces in the bark below the 

 node. Frequently large mucilage cavities in pith and cortex. 



A. Tube of fruiting calyx smooth. 



1. D. turbinatus, Gaertn. f. — Syn. D. Icevis, Ham.; Roxb. Cor. PL t. 213; 

 Kurz, F. Fl. i. 114. Vera. Gurjun, Chittagong; Kanyin-ni, Burm. 



Leaves ovate or ovate-lanceolate, blade 5-12 in., petiole rarely more than 

 I the length of blade, secondary nerves 14-18 pair. Varies greatly in 

 regard to the pubescence of young shoots, leaves and inflorescence. Kurz calls 

 the form with glabrous and glossy leaves. D. Icbvis, that with hoary leaves 

 D. turbinatus. 



Cachar, Tipperah, Chittagong hills, Burma, Andamans, Malay Peninsula. Fl. 

 April. Fruit May. Asa rule not gregarious, but scattered in mixed forest, generally 

 taller than the trees associated with ii . North of Bhamo D. Icevia is reported to grow 

 gregarious in patches, fields wood nil. Heartwood rcddis!i-grey,notdurable. Closerj 

 allied is •_>. D. indicus, Bedd. PL Sylv. t. 94 (// luvhhwlus, Cooke, Bombay Fl. i. 84 

 Yennemara, Coorg; Emwi. Tarn.; Velai/ani, Mai. Evergreen forest of the Western 

 Ghats from North Kanara southwards. PI. January-March. Petioles longer, J to j 

 the length of blade, and secondary nerves less numerous, 10-18 pair. 



3. D. obtusifolius, Teystn. : Kurz, F. Fl. i. 115. 



young shoots, petioles and inflorescence] densely clothed with long pale 

 lawny hair. Leaves broadly ovate, obtuse, to !) in. long, pubescent above, 

 softly tomentose beneath, secondary nerves 12-14 pair. Fl. showy, pink, 

 shortly pedicellate on short axillary racemes. Fruit 1] in. diam. 



Throughout tie' Eastern Peninsula, 20° X. Lat. its northern limit. In Cochinchina 

 and Cambodia very common and gregarious. Ascends to li.onn ft. in Pegu andMarta- 

 ban ; at higher elevations gregarious, forming forests similar to t^hose of I), luber- 

 culatus. I>. v< ^itus, Wall., Tavoy, very similar and probably not specifically distinct. 



1. D. pilosus, Koxli. ; Kurz 1''. Fl. i. 115. — Syu. I>. Baudii, Korthals. 

 Young shoots, stipules and petioles densely clothed with tawny fascicled 



I hairs. Leaves elliptic-oblong, shortly acuminate, s is in. long, filiate at tin' 

 edges, hairy beneath, secondary nerves 20-26 pair. Fruiting calyx glabrous, 

 ovoid. 2 in. long, wings to '■) in. Fruit densely pubescent. 

 Damp forests in the upper pari of the Assam valley, Chittagong hills, Aracan, Lower 

 Burma, Andamans(?). Fruit April, Sumatra (gregarious, Korthals), Bangka, Yields 

 a semifluid resin, 



