Annual herb 10–40 cm tall. Stems smooth or weakly 5-ribbed, glabrous or sparsely scabrous. Leaves opposite at base, alternate above, subsessile or with winged petiole to 10 mm long, linear to lanceolate, entire or serrate; lamina 20–55 mm. Inflorescence of 3–7-flowered dichasia; bracts linear, 7–30 mm long, serrate or entire, green; bracteoles membranous, linear, 0.7–1 mm long, entire, brown, deciduous. Flowers 3-merous; pedicel to 1.5 mm long. Sepals cordate to rhomboid, 0.6–0.9 mm long. Petals 2–2.7 mm long, red. Stamens 6. Ovary 3-locular, strongly 3-ribbed or-winged, smooth; styles 3. Fruit trigonous, 4–6 mm long, 2.5–3.5 mm wide (including wings), 3-winged, glabrous or pilose; wings woody with 3–5 transparent 'windows'.
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