Tree, up to 27 m, 40 cm dbh. Twigs glabrous to minutely patently hairy. Axillary buds erect to half-patent, (1.5-)3-8 mm long, not thickened at base, glabrous to densely minutely hairy; enclosing a pair of nearly similar buds of second order (those at base of a new twig often half-patent). Petiole 4-12 mm, sometimes with 1 or 2 glands in apical part. Leaf-blade 4—12(—15) by 1—4.5(—9) cm, apex sometimes cuspidate; above dark green to brownish; beneath lighter coloured, smooth to glaucous-papillose, secondary nerves 4-6 pairs, usually forming an indistinct intramarginal nerve in apical half; glands 4-20, scattered but often near midrib, 0.2-0.3 mm diam. Inflorescences up to 10 cm long, at very base with 2 side-axes or with a pair of buds of second order; axes often reddish brown, densely minutely patently hairy; lower bracts opposite. Pedicel 1-4.5 mm, grooved, densely minutely appressedly hairy. Sepals sometimes with 2 glands in apical part; outer sepals 1.6-2.5 by 2.1-2.7 mm; inner sepals 2.6-3.3 by 2.1-3 mm. Petals white, the upper ones with a yellow spot, when dry dark red to orange-red, the longest one (5—)7—8 mm long; carina densely more or less appressedly hairy outside; other petals glabrous to appressedly hairy outside in apical part. Stamens: filaments widened above base and with a knob-like, densely hairy appendage at inner side, further glabrous; anthers (0.3-)0.4(-0.5) mm long. Ovary 0.5-2 mm stalked, more or less appressedly hairy; ovules 4. Fruit globular, up to 1.5 cm diam., more or less smooth brown, appressedly hairy; pedicel up to 4 mm.
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