Tree (to 30(–45) m with clear bole to 13 m and 65 cm diam. Buttresses to 3.5 m tall, forming plankroots to 5 m long at base. Bark grey-green, smooth and lenticellate to fissured or flaking, the ± rectangular flakes leaving brown patches; inner bark thin, fibrous and pinkish, red mottled, creamy yellow within; sapwood straw. Leafy twigs 6–8 mm diam., grey-brown with prominent cicatrices and sometimes white latex. Apical buds with fist-shaped young leaves. Leaves to 1.5 m, in dense terminal spirals, imparipinnate, 5–8-jugate; petiole 6–11 cm, terete to grooved adaxially proximally, swollen somewhat at base, ± finely pubescent; rachis 2–4 mm diam., terete, ± pubescent. Leaflets 14–20 by 5–8 cm, opposite to subopposite, shiny midgreen adaxially, paler abaxially, the apical one elliptic-ovate to-obovate, symmetrical, the laterals elliptic-ovate, the most proximal ovate and smallest, apices acuminate, bases obtuse to subcordate (to cuneate in apical leaflet), markedly asymmetric especially in most proximal leaflets, ± pubescent abaxially, sometimes conspicuously brown-pubescent, venation brochidodrome, costae c. 14 on each side, arcuate, drying paler adaxially, prominent and pubescent abaxially; petiolule l–4(-6) mm (–12 mm in apical leaflet). Racemes or narrow thyrses to 10 cm long, solitary or fasciculate in axils or on twigs, sericeous; bracts c. 2 mm long, triangular, pubescent. Flowers sometimes in sessile cymules, hyacinth-scented. Pedicels 2–3 mm, pubescent. Calyx c. 2.5 mm long, campanulate, adpressed pubescent, deeply 4-lobed, lobes acute. Petals 4, c. 8–11 mm long, linear-oblong, acute, imbricate, sparsely hairy without, white. Staminal tube subglabrous without, pilose within, conspicuously 8-(or 9-)striate, white, the margin 8-lobed, lobes subtruncate, emarginate or erose; anthers 8 (or 9), c. 1 mm long, oblong-ovate, alternating with lobes. Disk 3–4 mm tall, glabrous or sparsely hairy within, margin irregularly lobed. Ovary (3-or) 4-locular, adpressed pubescent; style adpressed pubescent; stylehead discoid, yellow. Infructescence to 10 cm or fruits solitary, rachis to 9 mm diam. Capsule to 4 cm long, 2 cm diam., pyriform to fusiform, (3-or) 4-valved, silky grey-green hairy; pericarp soft, with white latex. Seeds 2–4, testa black, partially enveloped in a white hilar (?) aril; the cotyledons green.
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Trees to 25 m tall, evergreen. Bark exfoliating, endodermis yellowish. Young shoots pubescent. Leaves alternate, 35-46 cm, odd-pinnate; rachis densely yellow pubescent; leaflets 7-15, opposite to subopposite; petiolules 4-6 mm, densely pubescent; leaflet blades oblong but apical one obovate-oblong, 9-16 × 3-6 cm, papery, abaxially densely pubescent along veins, adaxially only on midvein, secondary veins 10-14 on each side of midvein, base oblique, apex acuminate to shortly acuminate. Thyrses on older branches and sometimes axillary, solitary or 2-or 3(-10)-conglomerate, 5-9 cm, rachis densely pubescent. Flowers yellowish, 8-10 mm. Pedicel 2-4 mm, densely pubescent. Calyx cup-shaped, 3-4 mm, 4-lobed; lobes triangular, outside sparsely pubescent, inside glabrous. Petals 4. Staminal tube 6-8 × ca. 2 mm, both surfaces sparsely pubescent, margin 8-lobed, each lobe tip 2-cleft as 2 teeth; anthers 8, slightly included within tube. Disk tubular to urceolate, ca. 2 mm high, glabrous, apex undulate. Ovary included in disk, densely covered with thick trichomes, 4-locular; style ca. 8 mm, sparsely villous; stigma peltate. Capsule yellowish green, ellipsoid to obovoid, 4-6 × 2.5-4 cm; pericarp densely covered with pulverulent yellow trichomes. Seeds bright red, with a salmon-colored aril. Fl. Apr and Sep, fr. Apr-May and Oct-Nov.
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