Herbs annual or biennial, 20-25 cm tall, glabrous. Basal stem leaves opposite and others alternate, elliptic, ca. 1.5 × 0.5 cm. Flowering stem many branched, erect; branches divergent, to 20 cm. Inflorescence a ± corymbiform panicle, ca. 10 × 15 cm; branches to 10 cm, each with a dense, small, 10-20-flowered cyme to 10 mm in diam.; bracts sessile, ovate, 2-3 mm, apex acute; pedicels short. Sepals narrowly triangular, 1.5-2.5 × 1-1.2 mm. Petals deep red to purple, oblong-triangular or oblong-ovate, 3.5-4 × ca. 1.2 mm, apex acute or acuminate. Stamens ca. 3 mm; filaments basally gradually broadened; anthers golden yellow. Nectar scales broadly quadrate, apex subemarginate. Carpels erect, lanceolate, ca. 3 mm, base broad. Styles recurved, slender, ca. 1.5 mm. Fl. Jul-Oct.
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