Dipterocarpus] XVII. DIPTEROOARPACE.^ 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-fld. axillary panicles. 

 Receptacle concave, continued into a campanulate or obconical calyx tube 

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

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

 tinued into a conical fleshy stylopodium, 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. 



TsTumerous (^x^ to 100) resin ducts in a leaf-bearing internode near the circum- 

 ference of tlie pitli. The lateral leaf traceb enter tlie bark at varying levels^ generally 

 in the upper lialf of tlie internode. Numeroiib btipalar 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. Icxvis^ Ham.; Roxb. Cor. PL t. 213; 

 Kurz, F. Fl. i. 114. Vern. Gtirjttn^ 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, Icevis, that with hoary leaves 

 D. turhinatus, 



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

 AiDril. Fruit May. As a rule not gregarious, but scattered in mixed forest, generally 

 taller than the trees absociated with it. North of Bhamo D. Ice vis is reported to grow 

 gregarious in patches. Yields wood oil. Heart%vood reddish-grey , not durable. Closely 

 allied is 2. D. indicns, Bedd. Fl. Sylv. t. 94 (D. turhuiatus, Cooke, Bombay Fl. i. 84). 

 Yennemara, Coorg; JEnnai, Tarn.; Velca/ani, Mai. Evergreen forest of the Western 

 Cxhats from North Kanara southwards. Fl. Jaxiuary-March. Petioles longer, J to ^ 

 the length of hlade, and secondary nerves less numei*ous, 10-15 pair. 



3. D. obtusifolius, Teysm. ; Kurz, F. Fl. i. 115. 



Young shoots, petioles and inflorescence j densely clothed with long pale 



tawny hair. Leaves broadly ovate, obtuse, to 9 in. long, pubescent above, 



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



shortly pedicellate on short axillary racemes. Fruit l^^ in. diam. 



Throughout the Eastern Peninsula, 20° N. Lat. its northern limit. In Cochinchina 

 and Cambodia very common and gregarious. Ascends to 8,000 ft. in Pegu and Marta- 

 ban; at higher elevations gregarious, forming forests similar to those of JD. fuher- 

 culatus, JD, vebtiftis, Wall., Tavoy, very similar and x^robably not specifically distinct. 



4. D. pilosus, Eoxb. ; Kurz F. Fl. i. 115.— Syn. D. Bandli^ Korthals. 

 Young shoots, stipules and petioles densely clothed with tawny fascicled 



hairs. Leaves elliptic-oblong, shortly acuminate, 8-18 in. long, ciliate at the 

 edges, hairy beneath, secondary nerves 20-25 pair. Fruiting calyx glabrous^ 

 ovoid, 2 in. long, wings to 9 in. Fruit densely pubescent. 



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

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



a semifluid resin. 



P 



