Stem twining, minutely pubescent, becoming glabrous; leaves thin, spreading; petiole 1/4-1 1/2 in. long, slender, puberulous along the channel on the upper side; blade 1-3 1/4 in. long, 1/3-1 2/5 in. broad, elongate-oblong or oblong-ovate, acute or acuminate, varying from subtruncate to deeply cordate at the base, with rounded basal lobes, glabrous or with a sparse pubescence on both sides; cymes lateral at the nodes, umbel-like or the axis elongating with age into a short raceme, pedunculate or subsessile, 5-to many-flowered; peduncles 1-8 lin. long, puberulous; pedicels 1-4 lin. long, puberulous; sepals 1/2-3/4 lin. long, ovate, acute or acuminate, puberulous; corolla 1 1/2-2 lin. in diam.; lobes ascending-spreading, 2/3 to nearly 1 lin. long, ovate or oblong, subacute, glabrous, green (Schlechter); corona arising from the base of the staminal column and equalling or shortly exceeding it, 1/2-2/3 lin. long, cup-shaped, white, very variable in toothing and lobing, usually with 5 entire or bifid teeth from a broad base, with or without 5 minute teeth alternating with them, but sometimes with 5 pairs of filiform teeth, sometimes divided to the base into 5 cuneately subquadrate lobes alternating with the anthers, produced at the apical angles into teeth and entire or denticulate between them; usually there are 2 slight keels within opposite each of the principal teeth, or when divided into quadrate lobes there is a keel near each margin, but in some flowers the keels seem absent or are obliterated in the process of drying; staminal column not exceeding the corona, not stipitate; anther-appendages suborbicular, inflexed over the style-apex, which has a minute central projection.
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A climber. It grows 3 m tall. The stems are thin and twining. It has a woody rhizome. The leaves are opposite and simple. The leaf stalk is 1-3 cm long. The blade is broadly sword shaped and 4-6 cm long by 204 cm wide. The base is heart shaped and it tapers to the tip. The leaves are long and have a thin texture. The flowers are in groups of 5-20. The fruit are made up of 4 brown follicles.
Clayey loam soils in forest margins, thickets, and grasslands; often near water; also along roadsides and in disturbed areas, at elevations up to 1,800 metres.
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A tropical plant. It grows on the edges of forests and in grassland often near water. It grows from sea level up to 1,800 m above sea level.
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