Stem twining, thinly puberulous or glabrous; leaves thinly coriaceous; petiole 1/3-1 in. long; blade 1 1/4-3 1/2 in. long, 2/3-1 1/2 in. broad, lanceolate, ovate-lanceolate, broadly ovate or elliptic-ovate, acute or acuminate to obtuse and apiculate, cuneate to broadly rounded at the base, glabrous on both sides; peduncles lateral, sometimes 2 at a node, 1-2 in. long, slender, usually bearing 2-3 umbels 1/4-3/4 in. apart, or occasionally with 1 umbel, puberulous on one side or glabrous; umbels 5-11-flowered; bracts minute; pedicels 4-7 lin. long, slender, glabrous; sepals 1/2-3/4 lin. long, 1/3 lin. broad, lanceolate-oblong, obtuse or acute, more or less ciliate, otherwise glabrous; corolla rotate, dark dull purple, glabrous outside, with a thin microscopic powder-like puberulence on the inner face, invisible when wetted; lobes 2 lin. long, 1 lin. or rather more in breadth, oblong or oblong-lanceolate, obtuse; corona-lobes entirely adnate to the upper half of the filament part of the staminal column, wedge-shaped, in side view sloping outwards from the acute apex to the very prominent truncate base, where the margin on each side is prominent and rim-like, the upper part being more compressed; staminal column about 3/4 lin. long and the same in diam. at the top; anther-appendages reniform, abruptly inflexed upon the top of the truncate style-apex, pollen-masses distinctly pendulous.
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Perennial, twining climber. Stems much-branched, usually > 2 m long when mature. Leaves subcoriaceous, broadly-lanceolate, ovate to ovate-elliptic, 27-90 x 17-38 mm, base cuneate to rounded, apex acute to rarely obtuse, always apiculate, glabrous; petioles 8-25 mm long. Inflorescences: pedunculate, 25-50 mm long; producing 1 or 2(3, umbel-like, 5-11-flowered cymes at nodes. Flowers with pedicels 8.4-15.0 mm long. Corolla rotate or slightly upward-spreading, lobed to base; lobes oblong to oblong-lanceolate, 4 x 2 mm, lower surface glabrous, upper surface shortly puberulous; dull purple. Staminal corona: lobes truncate at base, narrowing apically, sides prominent and rim-like, tuberculate, fused to rest of stamen in upper half, apex equalling truncate style-stigma-head.
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