Glabrous annual; stems twining, muricate.. Leaf-blade ovate or orbicular, 7–18 cm. long, 6.5–15 cm. wide, acuminate at the apex, cordate at the base; petiole 4–12 cm. long, smooth or muricate.. Inflorescences 1–few-flowered; peduncle 3–6 cm. long, muricate; pedicels 1–2 cm. long, smooth, becoming thick in fruit.. Sepals subequal, ovate to oblong; outer sepals 6–7 mm. long, with a long awn 4–6 mm. long; inner sepals 7–8 mm. long, with a rather shorter awn.. Corolla opening at night, pale bluish purple, 5–7.5 cm. long ;tube narrow and cylindrical, 3–6 cm. long; limb funnel-shaped or salver-shaped.. Capsule ovoid, 1.8–2 cm. tall.. Seeds ovoid, flattened, black, glabrous, 9–10 mm. long, 5 mm. wide.
A climbing herb. The stems have short spines. They are green when young and reddish-brown when older. The leaves are broadly oval and with stalks. The base is heart shaped. They are 5-7 cm long and wide. The flowers are purple and occur as 1-5 together in the axils of leaves. The fruit is a capsule. It is oval.
A strong climber like the last (Ipomoea alba) with tubercled stems
Funnel-shaped flowers, white or reddish or lilac.