Author: Miquel
Morphological description
Liana , high climbing shrub , or small tree .
Leaves : petiole and main rachis 12-20(-26) cm long, pubescent, glabrescent; pinnae 7-17 pairs, pubescent. Leaflets 12-25 pairs per pinna, oblong, 5-12 by 1.5-3 mm, entire, glabrous, nerves and veins invisible (microphyll Pterolob lf/fl FT13 ).
Inflorescences 10-35 cm long, rachis and branchlets pubescent, densely flowered; pedicels 3-8 mm, sparsely puberulous.
Flower : Hypanthium c. 1 mm high, sparsely puberulous outside. Calyx lobes oblong-ovate, 3.5-4.5 by 1.75-2, almost glabrous except ciliate on the margins. Petals : standard oblong-elliptic, c. 4 by 2 mm, glabrous outside, densely puberulous on the lower half inside and on the margins; the others oblanceolate, 3-4 by 1-1.5 mm, glabrous except puberulous on the lower 1 mm inside and on the margins. Stamens : 7-8 mm; filaments hairy at the lower 2 mm; anthers oblong, c. 1 mm long. Ovary puberulous or only on the convex side, 2-ovuled; style 6-7 mm (microph Pterolob pod/fl FT13).
Pods not stipitate; seed-bearing part broadly ellipsoid or suborbicular, 1.5-2 by 1-1.5 cm, slightly reticulate, puberulous, glabrescent, or glabrous; wing 5-6 by 1.3-1.8 cm, the basal part gradually narrowed along the margin of the seed-bearing part towards its base (microph Pterolob pod/fl FT13 ).
Seeds 6.5 by 5.5 mm.
Distribution
Burma (Tenasserim), Thailand (Peninsula), Cambodia, Laos, Vietnam; Malesia : Sumatra, Malay Peninsula (Selangor) incl. Langkawi I., Java, Lesser Sunda Islands (Bali, Sumbawa).
Habitat & Ecology
Scattered in forests, open heath country by stream, and thickets on riverbank, up to 500 m altitude (outside Malesia up to 1200 m). Fl. June, November, December; fr. May-July.