Lianas; stems with 4 phloem arms in cross section; branchlets terete with conspicuous interpetiolar glandular fields; pseudostipules triangular to ovate, short, acute. Leaves 3-foliolate, the terminal leaflet often replaced by a simple tendril. Inflorescence a narrow-bracteate, contracted, racemose panicle, axillary on older branchlets. Flowers with the calyx cupular, truncate, conspicuously 5-denticulate, usually stellate or dendroid pubescent; corolla lavender, more or less tubular-campanulate, dendroid-puberulous without; anthers glabrous, the thecae straight, divaricate; pollen grains 3-colpate, the exine almost smooth; ovary flattened ovoid, densely lepidote, the ovules 6-8-seriate in each locule; disc cupular-pulvinate. Fruit a compressed, woody, ellipsoid capsule, the valves parallel to the septum, more or less smooth or with slightly raised glandular areas, the median nerve not evident, the seeds thin, the wings hyaline-mem-branaceous, sharply demarcated from the seed body.
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