66 



XVII. DIPTEROCARPACEiE 



[Dipterocarpus 



-Dipterocarpus pilosus, 

 Roxb. A. 



B. Tube of fruiting calyx with 5 protuber- 

 ances near its mouth. 



5. D. tuberculatus, Roxb. ; Kurz, F. Fl. 

 i. 113. Vera. Eng (In), Burm. 



Stipules 4-5 in. long, greyish-tomentose. 

 Leaves up to 18 in. long and 14 in. broad, 

 cordate or broadly-ovate, apex rounded, glossy 

 above, glabrous or slightly pubescent beneath, 

 secondary nerves 10-15 pair, arching. Fl. 

 large, petals 1|^ in. long, tomentose outside. 

 Fruiting calyx tube obovate, velvety when 

 young, glabrous when mature, between the 

 segments produced into 5 sharp knobs. Nuts 

 tomentose. 



Throughout the Eastern Peninsula from Pegu 

 to Cambodia, northern limit at 25° N. Lat. Em- 

 inently gregarious, forming extensive forests on 

 laterite at the foot of the hills of Lower and Upper 

 Burma, accompanied by subordinate species, Ten 

 minalia, Eugenia, Dillenia, Symplocos and others. 

 Yields wood oil and resin. PI. April. Pr. May. 

 Heartwood red, moderately durable. 



0. Tube of fruiting calyx with 5 longitu- 

 dinal wings. 



6. D. alatus, Roxb.; Kurz, F. Fl. i. 116. 

 Vera. Kanyiribyu, Burm. 



Shoots and stipules pubescent. Leaves 

 ovate or elliptic, acute, pubescent beneath, 

 margin ciliate, secondary nerves 12-15 pair, 

 blade 4-6 in., petiole (softly hairy) 1-1 ^ in. 

 long. Wings on fruiting calyx tube broad, 

 half the diameter of tube or more. 



Pegu, Tenasserim, Siam, Cambodia. PL April, fruit May. Not gregarious, but 

 scattered in mixed forests, generally taller than the trees associated with it. Heart- 

 wood greyish-red, not durable. The medullary rays consist of two classes of cells, long 

 and short ; the long cells (up to 012 inch long) are filled with wood oil. 



Closely allied and possibly not distinct is 7. D. costatua, Gaertn. f., Lower Burma, 

 South Tipperah, near the coast (Hamilton), wings on calyx tube narrow. S. D. incanus, 

 Roxb. Pegu, South Andaman (common), Chittagong (doubtful), Tongkah in Siam on 

 the east coast of the Malay Peninsula at its north extremity. Branchlets, young shoots 

 and petioles softly hairy. Leaves ovate, thinly pubescent on both surfaces, margin 

 ciliate. 9. D. Bourdilloni, Brandis in Hook. Ic. Plant, t. 2403 (Kar angili, Mai.). Carcoor 

 Ghat (Malabar), Travancore, evergreen forest in the low country. A lofty tree, young 

 shoots, branchlets and petiole softly velvety. Leaves elliptic, shortly acuminate, tomen- 

 tose beneath, 6-10 in. long, secondary nerves 12-18 pair, tube of fruiting calyx glab- 

 rous, 1J in. long, wings on tube J in. wide. Similar to D.insignis, Thwaites, of Ceylon, 

 but distinct. 



2. ANISOPTERA, Korthals ; Fl. Brit. Ind. i. 300. 



Stipules small, early deciduous. Stamens 20-35, anther cells unequal, con- 

 nective prolonged into a long awn. Stylopodium thick, fleshy, bearing 3, 

 sometimes 4-6, short styles. Fruiting calyx adnate to fruit, globose or cam- 

 panulate, 2 segments uracil larger than the others, with 3 prominent longi- 

 tudinal nerves and numerous transverse veins. Species'15. 



In the circumference of the pith 18-24 resin ducts. The lateral leaf traces enter the 

 bark at varying levels, in some species at the base of the internode. In the petiole a 

 complete circle of 7-13 vascular bundles, with a resin duct in each, and a central mass 

 of vascular bundles, without resin ducts. 



