Tree, 4-20 m, not rarely poorly developed and with irregular crown, 10-35 cm ø; innovations, thyrse and calyx with dark rusty, multicellular compactly branched hairs. Leaves 20-50 cm long; leaflets 2-3(-4) pairs, subsessile, the lowest often close to the base of the petiole and smallish and orbicular auricle-like, the terminal leaflet largest, mostly obovate to oblong to elliptic, obtuse to acuminate, underneath with scattered crateriform plate glands and glandular spots and with yellowish-pubescent, stellate hairs (sometimes on short, multicellular stalks), 7-24 by 4-19 cm; petiole 0-8 cm, sulcate as is the rachis. Thyrse terminal, stout, erect, lax-flowered, c. 20 cm. Calyx campanulate, c. 2½-3½ by 1½-2 cm, inside sordid white, thick, persistent; lobes ½-1 cm, subequal, entire. Corolla yellow-brown, white, yellowish green (brown in sicco)t outside woolly tomentose, inside glabrous, basal tube c. 1½-2 cm, upper tube c. 3-4 cm; the mouth c. 5 cm ø; lobes ± entire, 1-1½ by I½-2½ cm ø. Anthers ± included, cells ± free. Ovary elongate, brown stellate hairy, 1 cm, style 4 cm, ± exceeding longer stamens. Capsule subterete, pendulous, twisted, rusty by stellate hairs, 30-60 by lll2-2½ cm ø, the valves with 5 strong prominent ribs; septum flat, shining, corky, over 1 cm wide. Seeds variable in size in one capsule, c. 2½-3¾ by ¾-1¼ cm incl. the smallish wings.
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A deciduous tree. It grows 15 m high. The trunk has smooth shallow cracks. The bark is pale brown. The leaves are 45 cm long. The leaves have 2-4 pairs of leaflets and a leaflet at the end. These are rusty hairy underneath. The flowers are broadly funnel shaped. They are cream or yellow brown. They are in short erect clusters at the ends of the branches. The fruit pods are ribbed and twisted in spirals. They are up to 90 cm long.
Mixed deciduous or evergreen monsoon forest, also in bamboo forest often on limestone and calcareous soils, but in Burma preferring pervious siliceous soils (KURZ); 0-750 m. Fl. May-Sept.; fr. March-Sept.
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A tropical plant. It is native to Indochina and Malesia. It grows in open forest and secondary forest. It grows in limestone areas. It grows in coastal areas up to 100 m above sea level.
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