Stem twining, more or less pubescent or shortly hairy, mostly along two lines. Leaves spreading, rather paler beneath, thin; petiole 1–2 in. long, shortly hairy; blade 2–3 1/2 in. long, 1 1/2–2 1/2 in. broad, ovate, acute, with a fine point about 1/8 in. long, cordate, with rounded lobes and an obtuse sinus between them at the base, glabrous or with a few scattered hairs above and with scattered hairs beneath, the veins also pubescent along each side beneath. Umbels pedunculate, compound, 10–30-flowered; peduncles 1–1 1/2 in. long, shortly hairy along one side or glabrous; bracts 1–1 1/2 lin. long, subulate; pedicels 6–10 lin. long, pubescent. Sepals 1 lin. long, ovate, acute, ciliolate. Corolla-lobes 3–3 1/2 lin. long, linear-lanceolate, apex slightly curved, obliquely obtuse, glabrous. Corona 2–2 1/4 lin. long, tubular for half its length, then with 5 long subulate erect or recurved lobes and 5 very short obtuse entire or bifid teeth alternating with them, but no teeth or lobes within. Anthers broadly deltoid, subsessile, with orbicular appendages, connivent around the stout fleshy obtuse apical part of the style, which is shortly exserted beyond them.