A glabrous or sparsely hairy twiner, adult stems lignescent, 1½-3 m. Leaves ovate or ovate-oblong, 4-8 by 2-4 cm, cordate at the base, acuminate at the apex; petiole 1-3 cm. Peduncles long and slender, 5-10 cm. Flowers in 3-12-flowered umbelliform cymes. Bracts minute. Sepals glabrous; two outer ones ovate to elliptic, 4-6 mm long, obtuse; three inner ones longer, more oblong, 5-7½ mm long, obtuse. Corolla blue or violet, the midpetaline bands paler outside, ca 2½-3 cm long. Stigmas broadly elliptic to orbicular.
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