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

 clavate appendage, valves equal. Ovary as, ^n. Hopea. iVwi 1-seeded. Seed 

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

 radicle superior. — Disteib. Endemic in Ceylon. Species 10. 



1. D. zejrlanica, Thwaites in. Hook. Joum. 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. Sylmt. t. 97 ; A. DC. Prodr. xvi. 2, 626. 



Ceti.on ; Central province, ascending to 4000 ft. 



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

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

 above ; petiole ^ in. Panicles 1 in,, erect, many-flowered ; bracts small, brown, deci- 

 duous. Flowers f in. diam., pink ; pedicels \ in., erect. Outermost calyx-segments 

 deltoid-ovate, obtuse. Anthers with an appendage about J 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 J in. Panicle 2 in., racemose, 3-6-flowered. Flowers 

 I in. diam. ; pedicels J in. decurved, then erect. Outermost calyx-segments oblong, 

 obtuse, glabrous, scarcely varnished. Winged fruiting calyx-segments 1-14 ii^-i oblong 

 or oblanoeolate, tip rounded, base narrow, gibbous. 



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

 rounded lateral nerves inconspicuous ascending, pedicels about equalling 

 the calyx. A. DG. Prodr. xvi. 2, 627. 



-Cevlon ; between Eatnapoora and Galle, at no great elevation, Thwaites. _ 

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

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

 subcorymbose, -e-S-flowered ; pedicels J 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 /S G.P. 3712 and referred subsequently {Enum. 402) to this 



4. D. trapezifolla, Thwaites Enum. 36; 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 viatls. Leaves 

 2J-34 by 1-lJ in., opaque, midrib slightly channelled above, lateral nerves about 12- 

 petidle 4 in. Panicle about 14 in., racemose, about 6-flowered. Flowers 4 i°- "'|™- 

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



