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Perennial; rhizome vertical to oblique, 1½-4 mm ø, bearing leaves and stems at apex. Stems up to 1 m, slender, rooted at some nodes, leafy, with flowers at some nodes. Leaves 1-10 by 1-6½ cm, 1-2 times as long as broad, ovate, deeply cordate at base, acute to acuminate, serrate or serrate-crenate, pubescent to hirsute above and beneath, especially on veins, rarely glabrous, usually pale green; petiole 1-17 cm, pilose especially distally, rarely glabrous. Stipules 7-30 by 1½-5 mm, lanceolate, Jong-acute, long-fimbriate, pubescent, fuscous or green. Flowers (5-)8-14 mm long, purple to white with darker veins; peduncle 4-12 cm, pilose especially distally, rarely glabrous. Sepals 3½-9 by 1-2 mm, linear-lanceolate, acute, entire or denticulate, usually pilose especially near base, ciliate; appendage 0.8-2½(-3) mm, pointed or denticulate, rarely rounded, pilose or rarely glabrous. Petals 1½-4 times as long as broad; basal obovate, sometimes slightly bearded; laterals oblanceolate, bearded; upper pair usually lightly bearded; spur 1-2½ mm, slightly shorter than to just exceeding calycine appendages, cylindrical, obtuse. Style 1½-3 mm, geniculate at base, somewhat thickened distally, apex gently or strongly curved to appear flattened or sometimes hooked, with simple emarginate stigma. Capsule 5-10 mm, ellipsoid, glabrous or pubescent in centre of valves.
A small creeping herb. It keeps growing from year to year. It is almost without a stem. The rhizome is erect and 3-5 cm long by 2-4 mm wide. The leaves are near the base. The flowers are purplish-white. The fruit is a flattened capsule 5-10 mm across and it can be hairy. The seeds have dotted lumps on their surface.
