Lianas; stems with 4 phloem arms in cross section; branchlets terete with interpetiolar glandular fields; pseudostipules inconspicuous or lacking. Leaves 3-foliolate, the terminal leaflet often replaced by a simple or trifid tendril. Inflorescence an axillary or terminal panicle. Flowers with the calyx closed and pointed in bud, splitting calypterately, or sometimes bilabiately, cupular and truncate (or bilabiate) at maturity; corolla white to magenta, tubular-infundib-uliform to tubular-campanulate, pubescent outside; anthers densely pubescent, the thecae straight, divaricate, the filaments glabrous or pubescent; pollen grains single, 3-colpate, the exine microreticulate; ovary oblong-conical, densely pubes-cent, the ovules 2-6-seriate in each locule, the style usually more or less pu-bescent; disc lacking. Fruit an elongate-linear more or less compressed capsule, the valves parallel to the septum, pubescent, the median nerve conspicuously raised, and also to some extent the margins or an area near them; seeds thin, bialate, the wings membranaceous, irregularly hyaline at least at tips.
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