Perennial herb 15–50 cm tall, with a deep stolon. Stems 4-ribbed, with spreading, uncinate hairs, rarely glabrous. Leaves subopposite or opposite below, alternate above, sessile, linear, trifid or multifid, scabrous; lamina 10–30 mm long. Inflorescence of 1–3-flowered dichasia; lateral inflorescences in upper axils; bracts linear, 3–5 mm long, entire, scabrous; bracteoles linear, 0.3–0.6 mm long, entire, brown. Flowers 4-merous, ±pendulous. Sepals narrowly deltoid, 0.8–1.2 mm long. Petals 2.2–2.8 mm long, red. Stamens 8. Ovary 4-locular, smooth, scabrous; styles 4. Fruit 1 or 2 per axil, pendulous, obpyriform, 1.5–2.4 mm long, 1.3–1.8 mm diam., 4-ribbed and angled, irregularly rugose in lower half, scabrous.
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