Roots ca. 2 mm thick. Stems 14--45 cm, ribbed. Proximal leaves 4 or 5, sheathing; distal ones 3--5; petiole purple, 0.5--1.5 cm; leaf blade ovate to ovate-oblong, 5--11 × 3.5--8 cm, veins 7--9, base slightly cordate and decurrent, margin slightly rough, apex shortly acute. Racemes 1--4-flowered; pedicel 0.8--4 cm, articulate at or above middle; bracts ca. 3 mm, 1-veined. Perianth segments arranged in a cross pattern, broadly ovate to ovate-oblong, subequal or inner ones longer than outer, 1.5--3.5(--6) × 2.5--3 mm, persistent, margins reflexed, papillose. Filaments minutely papillose; anthers elliptic, arched. Capsule ovoid, 1.6--1 × 0.8--1.2 cm, 2-valved.
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