Tadehagi triquetrum (L.) H.Ohashi

Shrubs or subshrubs. Stem erect, 1-2 m tall. Leaves 1-foliolate; petiole 1-3 cm, wing 4-8 mm wide; blade narrowly lanceolate to ovate-lanceolate, 5.8-13 × 1.1-3.5 cm, usually more than 3 × as long as wide, abaxially pubescent on midvein and lateral veins, adaxially glabrous, base rounded or shallowly cordate, apex acute or acuminate. Inflorescences 15-30 cm, 2-or 3-flowered at each node. Pedicel 2-6 mm, with spreading, minute, hooked and silky hairs. Calyx broadly campanulate, ca. 3 mm. Corolla pink to bluish or reddish purple, 5-6 mm; stan­dard nearly orbicular, emarginate at apex; wings obovate, auric­ulate, clawed; keel arcuate, auriculate, clawed. Stamens diadel­phous. Ovary densely puberulent except at upper part of style. Legume 5-8-jointed; articles not reticulate veined, densely yel­lowish or whitish strigose. Seed transversely broadly elliptic or elliptic, 2-3 × 1.5-2.5 mm. Fl. Jun-Oct, fr. Oct-Dec. 2n = 22.

Found on a variety of soils in evergreen or semi-deciduous forest, in the vicinity of watercourses, on bunds of rice fields, savannah and grasslands; at elevations from sea-level up to 1,500 metres, occasionally to 2,000 metres.

The tuberous root is chewed in place of betel nut. The dried leaves are used for a tea like drink.

Can be grown by seedlings.