A rambling or climbing shrub, quite glabrous; branches brown, dotted with lenticels, the flowering ones rather stout. Leaves mostly ternate, elliptic or ovate-lanceolate, acuminate, obtuse at the base, 3–3 1/2 in. long, 1 1/4–2 in. broad, firm, papery, glossy; secondary nerves 5–6 on each side, raised below; reticulation distinct; petiole 7–10 lin. long. Cymes terminal, few- to 1-flowered, subsessile, produced with the mature leaves; bracts numerous, ovate or ovate-lanceolate, acuminate. Calyx 5–6 lin. long; sepals ovate or ovate-lanceolate, acuminate. Corolla large, purple without, whitish within; infrastaminal part of the tube 3–4 lin. long, suprastaminal part wide, funnel-shaped, 3/4–1 in. long; lobes ovate gradually passing into a linear tail, 2–2 1/2 in. long; throat-scales lanceolate-subulate, glabrous, 3 lin. long. Anthers included, glabrous, shortly acuminate. Ovary glabrous.
