A vigorous climber, with a hollow glabrous stem. Leaves apparently slightly fleshy; petiole 3/4–1 1/4 in. long; blade 3–5 1/2 in. long, 2–3 in. broad, ovate to elliptic-ovate, rather abruptly cuspidate-acuminate, cordate, with a shallow broadly open sinus at the base, glabrous; only the primary veins visible on the underside. Flowers in small clusters or very short racemes scattered along the branches of lateral subsessile or shortly pedunculate lax cymes, which have 3 primary branches that are again once or twice trichotomously or dichotomously divided, the whole cyme having a spread of 4–5 in. with a height of 2–3 in., at first minutely rusty-puberulous, becoming glabrous; pedicels 1 1/2–2 lin. long, puberulous. Sepals 1/2– 2/3 lin. long, lanceolate, acute, glabrous. Corolla rotate, 2 1/2 lin. in diam.; lobes 1 lin. long, 2/3 in. broad, ovate, subobtuse, ciliolate along one margin. Coronal-tubercles fleshy, transversely-oblong, radiating from the base of the 1/3 lin. long staminal-column, with their upper face sloping nearly up to the base of the anthers, dark coloured in the dried state.
