Author: de Wit
Morphological description (leiocarpa Sindora BBGB18 f 12 ;leiocarpa Sind CToS40 )
Tree 25-40(-45) m high and 45-80 cm in diameter. Stipules lanceolate, 3-5 mm long, almost glabrous except slightly puberulous on the midrib beneath and on margins, caducous.
Leaves paripinnate, (2 or)3(or 4)-jugate; petiole 1.5-2.8 cm and rachis 4-11 cm long, both minutely puberulous, glabrescent, or almost glabrous; petiolules very short, up to c. 4 mm, slightly puberulous, glabrescent or glabrous. Leaflets thinly to rigidly coriaceous, elliptic, obovate- or broad-elliptic, 2.5-5(-9.5) by 2-3(-5) cm; apex obtuse, acute, or shortly acuminate, sometimes slightly emarginate; base obtuse or cuneate, slightly asymmetric; glabrous on both surfaces, except sometimes sparsely hairy on the midrib of lower surface.
Inflorescences (leiocarpa Sindora lf/inf 255223 ) paniculate, up to 16(-25) cm long, lateral branches up to over 5 cm long, both rachis and branches densely pubescent; bracts and bracteoles ovate, up to 4 mm long, densely puberulous; pedicels 1-1.5 mm, densely puberulous.
Flowers yellow, yellowish brown. Calyx lobes 4, elliptic or elliptic-oblong, obovate, or ovate, 4.5-5(-6) by 2-3(-3.5) mm, no spiny outgrowths on the outer surface, densely puberulous outside, appressed hairy insides. Petal 1, 5-6 mm long, slightly longitudinally folded and somewhat bent inward from the middle, the lower half (claw) densely puberulous outside and glabrous inside, the upper half (limb) glabrous except villose margin. Stamens: 10 (9+1), united basal parts of the filaments 2-3 mm high; free filaments and staminodes up to c. 7 mm, ciliate; 2 largest anthers ellipsoid, 2-2.5 mm long, the others (much) smaller, up to 0.75 mm long. Ovary subsessile or shortly stipitate (c. 1 mm), slightly obovate or elliptic, c. 2 mm long, densely woolly along the margins; style 8-10 mm, glabrous; stigma obscure.
Pods ellipsoid, ovoid, broadly ovoid, or suborbicular, 5-9 by 4.5-5.8 cm, flattened, smooth, obscurely veined, almost glabrous, beak up to 8(-14) mm long, recurvate, 1-3-seeded (leiocarpa Sindora pods on stem ).
Seeds broadly ovoid or suborbiculate, c. 13(-21) mm long, smooth, black; aril broader than high, often larger than the seed, smooth or rugose.
Distribution
Malesia: Sumatra (Jambi, Palembang, Riau), Borneo (Sarawak, Brunei, Sabah, Kalimantan).
Habitat & Ecology
In flat or sloping areas in lowland forest, occurring often on dryland, sometimes on sandy loamsoil, occasionally in secondary forest and seasonal freshwater swamp, usually below 100 m, rarely up to 412 m altitude.
Flowering in January, March-June, and Augustus-December; fruiting in March-May, and Augustus-December.
Uses
The wood has little value. It is used for boards, partition walls and household utensils.
Note
1. In the Arboretum, Semengoh F. R., Kuching (Sarawak), there is one tree of this species under the number 682 (see coll. S 14921, L).
2. This species is characterized by the combination of the following characters:
1) leaves (2)3(4)-jugate,
2) leaflets thinly to rigidly coriaceous, almost glabrous except midrib pubescent below, and with finely, closely reticulate venation,
3) inflorescences and flowers densely tawny pubescent or puberulous,
4) petal slightly folded longitudinally and somewhat bent inward from the middle,
5) pods smooth.