Lianas, but shrubby when young, stems with 4 phloem arms in cross section; branchlets terete without interpetiolar glandular fields; pseudostipules lacking. Leaves 3-foliolate, the terminal leaflet sometimes replaced by a simple tendril. Inflorescence a short axillary (rarely terminal), 1-12-flowered raceme. Flowers with the calyx of a thick spongy material, inflated-cupular, irregularly lobed; corolla large, infundibuliform-campanulate, the tube contracted above the ovary, sparsely and inconspicuously glandular-lepidote outside; anthers glabrous, the thecae straight, divaricate; pollen grains 3-colpate, microreticulate; ovary ovate-cylindric, narrowed slightly at the base, more or less glabrous, the ovules 4-8-seriate in each locule; disc annular-pulvinate. Fruit an oblong-elliptic or oblong capsule, the valves parallel to the septum, compressed, woody, smooth; seeds large, thin, the wings brown, not demarcated from the seed body.
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