84 xxiii, dim'ehocarpace.t. 



and oampanulate, or very short and adnate to the hase of the ovary ; 

 lobes 5, usually imbricate. Fruiting calyx enlarged ; tube free or adnate 

 to the fruit ; lobes unchanged, or 2-3 or all enlarged like a wing. 

 Petals 5, contorted, connate at the very base or free. Stamens indefinite 

 or 15, 10, or 5, hypogynous or subperigynous, free or cohering with one 

 another at the base, or, more rarely, with the petals ; tilaments short, 

 usually dilated at the base ; anthers erect, 2-celled, dehiscing introrsely 

 or laterally by a slit, valves of the cells equal or the inner smaller ; con- 

 nective often aristate or with an obtuse appendage. Ovary seated on 

 or slightly immersed in the torus, usually 3-celled ; ovuli s 2 in each 

 cell, pendulous or affixed laterally, anatropous ; raphe ventral ; micropyle 

 superior. Fruit free or enclosed in the enlarged calyx, indehiscent or 

 3-valved, 1- (rarely 2-) seeded. Seeds thick, equal or unequal ; testa 

 thin ; all3umen ; cotyledons equal or unequal, straight or more or less 

 plaited and crumpled ; radicle directed towards the hilum, usually in- 

 cluded between the cotyledons. — Distrib. All are natives of tropical 

 East Asia, except 3 species in Africa; genera 12 ; species about 106. 



Calyx iiuich enlarged in fruit ; lobes erect. 



Calyx in fruit with a distinct tube ; 2 lobes only en- 

 larged ; stamens cc 1 . DiPTEHOCAKrus. 



Calyx in fruit with an obscure tube ; 3 or all the lobes 



enlarged ; stamens 15-many 2. Siiorea. 



Calyx with only 2 lobes enlarged ; stamens 10-15 3. ITopea. 



Calj'x scarcely enlarged in fruit ; lobes reflexed 4. Vateeia. 



1. DIPTEROCARPUS, Gajrtn. 



Lofty resinous trees. Leaves coriaceous, entire or sinuate-dentate ; 

 stipules large, valvate, enclosing the terminal bud, afterwards caducous, 

 leaving an annular scar. Flowers large, few, in axillary racemes, white 

 or reddish. Calyx smooth, or variously ribbed or M'inged, or transvei'sely 

 lamellate ; tube free ; lobes slightly imbricate ^hen young, afterwards 

 open or subvalvate, unequal. Stamens indefinite ; anthers linear ; con- 

 nective acuminate. Ovary 3-celled ; ovules 2 in each cell ; style filiform. 

 Fruit nut-like, 1- (rarely 2-) seeded, woody, indehiscent, free, enclosed 

 in the eidarged calyx 2 lobes of which are produced into long wings. 

 Seed adnate to the base of the pericarp ; cotyledons very large and fleshy, 

 unequal; radicle inconspicuous. — Distrii!. Tropical Asia and IMalaya; 

 species about 60. 



1. Dipterocarpus turbinatus, Occrtn. f., Pmct. v. 3 (1805) p. 51, 

 t. 188. A tall tree ; trunk straight to the top ; bark deeply cracked. 

 Leaves 5-12 by 24-6 in., ovate, acute or very shortly acuminate, entire 

 or sinuate-crenate, glabrous on both surfaces, shining above, base rounded 

 or acute; lateral nerves ijrominent, 14-18 ])airs, oblique, parallel; 

 petioles l-2j in. long; stipuh-s oblong-oval e, acute, grey- velvety, with 

 a tuft of soft hairs at the apex. Flowers 3 in. in diam., in axillary, 

 3-8-flowered racemes. Calyx : tube obconic, hoary-puheridous, the 

 mouth contracted in fruit ; the 2 enlarged lobes (wings) 5 by 1 in,, 

 oblong, obtuse, strongly 3-5-nerved and rcliculately veined; the other 

 lobes deltoid. Petals white, tinged with red, linear, obtuse, ])uberulous 

 without, twisted in bud. Stamens numerous ; filaments yellow, linear- 

 subidate, terminated bv a long slender bristh'. Fruit 1 in. in diam.. 



