Shrub or small tree, up to 10 m, 25 cm dbh. Twigs glabrous or rarely minutely patently hairy. Axillary buds oblong or sometimes ovate-lanceolate, (1.3-)3-6(-10.5)mm long, the longer ones strongly thickened at base and usually suddenly widened and flattened upwards, usually glabrous, the smaller ones less distinctly flattened and usually rather densely shortly hairy; buds of second order often present. Petiole (8—)15—18(—23) mm, glabrous to rather densely minutely hairy, usually with 2 small, prominent glands. Leaf-blade (linear-)lanceolate, (9-)22-47 by (1.3-)5-10(-20) cm; base usually cordate with the margins curved upwards and connate above the apex of the petiole, or flat and rounded to broadly cuneate, apex acutish; above usually slightly bullate between secondary nerves and intra-marginal nerve, greyish green to brown; beneath usually brownish, glabrous to minutely patently hairy all over, secondary nerves (9-)13-20 pairs, mostly forming a distinct, nearly complete intramar-ginal nerve; glands 2-6(-20), usually near the midrib (if few, only present in basal part), 0.3-0.4 mm diam. Inflorescences sometimes also axillary on the older nodes; axes slightly angular, slightly grooved, main axis basally usually sparsely minutely appres-sedly hairy, side axes and main axis in upper part more densely hairy; flowers solitary or very rarely with 2 together; lower bracts opposite. Pedicel (1—)1.5—2(—3.5) mm, more or less distinctly grooved, densely minutely appressedly to patently hairy. Sepals often with minute, rather distinct glands; outer sepals (2.1—)2.8—3.8(—4.1) by (2.4-)3-4.9 mm; inner sepals 3-5.5 by (2.8-)3.4-4.6 mm. Petals pinkish to pale violet, the upper petals with a yellow spot, when dry dark red, the longest one (8.5—)9.5—12.5(—14.5) mm; carina rather densely appressedly hairy outside, inside sparsely minutely hairy in apical part only, further glabrous; other petals very sparsely minutely hairy above base outside, sparsely patently hairy outside near apex, inside glabrous to hairy up to ± halfway. Stamens: filaments free or connate over l(-2) mm, widened above base and especially those of abaxial stamens with a more or less distinct (half-)patently hairy knob-like thickening at inner side, further glabrous; anthers (0.6-)0.7-0.9(-l) mm long, ciliate along slits. Ovary (half-)patently hairy; style (rather) sparsely half-patently hairy in basal half, very sparsely hairy in apical half, glabrous near apex; ovules 4. Fruit globular, 1.5-1.8 cm diam., rather dull, light to reddish brown, distinctly hairy; pericarp thin, brittle.
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