Lianas; stems with 4 phloem arms in cross section, the extreme center mostly hollow; branchlets terete without interpetiolar glandular fields; pseudostipules inconspicuous or more or less spathulate and early deciduous. Leaves 3-foliolate, conspicuously pellucid-punctate from the lepidote-peltate glands on the lower surface, the terminal leaflet often replaced by a simple or trifid tendril. Inflo-rescence a few-flowered axillary raceme. Flowers with the calyx campanulate, sometimes more or less inflated, pubescent, irregularly shallowly bilabiate to 5-lobed; corolla white or cream, the lobes sometimes flushed with pink; anthers glabrous or pubescent on the margin of the thecal openings, the thecae straight, divaricate; pollen grains 3-colpate, the exine microreticulate; ovary linear-tetragonal, lepidote, the ovules 2-seriate in each locule. Fruit a narrow, linear capsule, the valves parallel to the septum, thin, convex, usually faintly striate and more or less pubescent; seeds thin, bialate, the wings membianaceous, brownish, weakly demarcated.
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