Doom.} xxv. DIPTEROCARPE^:. (W. T. Thiselton Dyer.) 311 



7. DOONA, Thwaites. 



Lofty glabrous and often glaucescent resinous trees, with the habit of 

 (except in H. nervosa} some species of Hopea. Leaves entire, firm, incon- 

 spicuously veined ; stipules small, deciduous or inconspicuous. Flowers 

 rather small, usually in lax panicles rarely exceeding the leaves. Calyx as 

 in Hopea. Stamens 15 ; anthers oblong, connective prolonged into a usually 

 clavate appendage, valves equal. Ovary as in Hopea. Nut 1-seeded. Seed 

 ovoid with the thin testa .interposed between the folds of the cotyledons ; 

 radicle superior. DISTRIB. Endemic in Ceylon. Species 10. 



1. D. zeylanica, Thwaites in Hook. Journ. iii. (1851) t. 12 and iv. 7 ; 

 Enum. 34 ; leaves lanceolate caudate-acuminate base deltoid lateral nerves 

 numerous ascending inconspicuous, pedicels exceeding the calyx. Beddome 

 Flor. Sylvat. t. 97; A. DC. Prodr. xvi. 2. 626. 



CEYLON ; Central province, ascending to 4000 ft. 



A tree of 60 ft. or more ; branchlets much divided, somewhat flexuose, with smooth 

 purple-brown bark. Leaven 2-3 by |-1 in., midrib prominent beneath, channelled 

 above ; petiole \ in. Panicles 2 in., erect, many-flowered ; bracts small, brown, deci- 

 duous. Flowers f in. cliam., pink ; pedicels ^ in., erect. Outermost calyx-segments 

 deltoid-ovate, obtuse. Anthers with an appendage about \ as long, glabrous, varnished. 

 Nut (immature) ^ in. long, ovoid ; winged fruiting calyx-segments about 1 in. oblan- 

 ceolate with an ovate base, at first bright red. Yields a gum resin manufactured into 

 a varnish. 



2. D. nervosa, Thwaites Enum. 35 ; leaves oblong elliptic or ovate 

 caudate-acuminate base rounded lateral nerves prominent beneath ascend- 

 ing, pedicels about equalling the calyx. A. DC. Prodr. xvi. 2, 627. 



CEYLON ; Ekualagodde near Ratnapoora, Thwaites. 



A large tree ; branchlets dichotomously divided with rather pale brown bark trans- 

 versely rugose on the ultimate twigs when dry. Leaves 34-44 by 14~2 in., lateral 

 nerves about 9 pairs; petiole ^ in. Panicle 2 in., racemose, 3-6-flowered. Floivers 

 | in. diam. ; pedicels \ in. decurved, then erect. Outermost" calyx-segments oblong, 

 obtuse, glabrous, scarcely varnished. Winged fruiting calyx-segments 1-14 hi., oblong 

 or oblanceolate, tip rounded, base narrow, gibbous. 



3. D. affinis, Thwaites Enum. 35; leaves oblong caudate-acuminate base 

 rounded lateral nerves inconspicuous ascending, pedicels about equalling 

 the ealyx. A. DC. Prodr. xvi. 2, 627. 



CEYLON ; between Ratnapoora and Galle, at no great elevation, Thwaites. 



Branchlets dichotomously divided, brown barked. Leaves 2-3 by 1-1 1 in., lateral 

 nerves about 6 pairs, midrib channelled above ; petiole 4 in. Panicle 1^-2 in., peduncled, 

 subcorymbose, 6-9-flowered; pedicels | in., at first decurved. Outermost calyx-seg- 

 ments oblong, obtuse, glabrous, scarcely varnished. Fruit unknown. This description 

 does' not completely agree with that of Thwaites; it is drawn up from specimens 

 distributed as D. nervosa ft C.P. 3712 and referred subsequently (Enum. 402) to this 

 species. 



4. D. trapezifolia, Thwaites Enum. 35 ; leaves rhomboid-lanceolate 

 gradually caudate-acuminate base obtuse lateral nerves inconspicuous 

 spreading, pedicels exceeding the calyx. A. DC. Prodr. xvi. 2, 627. 



CEYLON ; Central and Southern provinces ; common, ascending to 1500 ft., Thwaites, &c. 



A large tree ; branchlets much divided, bark brown with minute pale warts. Leaves 

 2^-34 by l-l in., opaque, midrib slightly channelled above, lateral nerves about 12; 

 petiole 4 in- Panicle about 14 in., racemose, ab'mt 6-flowered. Flowers 4 in. diam.; 

 pedicels in. erect. Outermost calyx-segments oblong-lanceolate, obtuse. Nut | in. 



