Lianas (in Central America), stems with (4-)8 phloem arms in cross section; branchlets terete without interpetiolar glandular fields; pseudostipules foliaceous or lacking. Leaves 2-5-foliolate, often with a simple or trifid terminal tendril. Inflorescence an axillary or terminal raceme. Flowers with the calyx cupular, truncate, usually with glands near the margin; corolla bright to pale yellow, tubu-lar-campanulate, glabrous or glandular-lepidote outside; anthers glabrous, the thecae straight, divaricate; pollen grains simple, ecolpate or 5-colpate, the exine reticulate; ovary ellipsoid, usually stipitate, lepidote or puberulous, the ovules 2-6-seriate in each locule; disc pulvinate. Fruit an elliptic to orbicular capsule, the valves parallel to the septum, usually strongly compressed, smooth; seeds flat, completely surrounded by a broad hyaline-membranaceous wing, or wingless and the seed body larger, brown and corky.
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