Herbs annual, erect, 5-25 cm tall. Roots slender, fragrant. Stem thin, multibranched, 3-winged, glabrous. Petiole 1.5-2 mm; leaf blade ovate-cordate or cordate, 5-16 × 5-12 mm, membranous, glabrous, 3-veined, base cordate or truncate, margin entire or slightly undulate, apex obtuse, mucronate. Spike terminal, 1-6 cm, elongated after anthesis. Flowers very small, 2-3 mm, sessile; bracts caducous, very small. Sepals 5, persistent, connate at base, linear-subulate, 0.4-0.5 mm. Petals pink-purple; lateral petals ca. 2.5 mm; keel ca. 3 mm. Filaments ca. 2 mm, united into an open sheath, inside of sheath arachnoid; anthers connate. Ovary reniform, ca. 1 mm in diam., margin narrowly triangular-denticulate; style ca. 2.5 mm; stigma slightly lobed. Capsule reniform, ca. 1 mm, ca. 2 mm in diam., both lateral margins pointedly triangular-denticulate; surface of capsule with protruding reticulations. Seeds 2, black, shiny, ovoid, ca. 1 mm in diam. Fl. Jun-Aug, fr. Aug-Oct.
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Herb up to 30(-40) cm. Lateral stems often long and patent, stem glabrous, 0.5-1 mm wide, the wings up to 0.8 mm wide. Leaves broadly ovate, 4-15 by 3-10 mm, slightly cordate at base, acutish and mucronate at apex, 3-5-nerved, glabrous; petiole 0.5-2 mm. Flowers 1.7-2.3(-2.6) mm long, white to light violet. Sepals subequal, 0.5-0.8 mm long. Keel at lower side densely minutely papillose. Anthers 4 or 6, rarely 5, c. 0.15 mm long. Capsule c. 1 by 1.5-2 mm, walls of cells with protruding reticulate venation; spines up to 0.5(-0.75) mm long.
Sunny or slightly shaded open places in grasslands, bracken, deciduous jungle or primary forests, usually on wet sand, clay or rock, not common, but locally abundant, 0-1500 m.
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