Herbs, sometimes weak at base, ascending above, to 45(-100) cm tall; stems obtusely 4-angled, drying purple, glabrous or subglabrous. Petiole 1-4 cm, subglabrous; leaf blade drying membranous or thinly papery, adaxially dark green, abaxially pale green or red, ovate, elliptic, or lanceolate, 9-15 × 3-6.5 cm, glabrous on both surfaces or sparsely strigillose adaxially, base cuneate to obtuse, apex long acuminate or cuspidate; secondary veins 10-14 pairs; stipules caducous, not seen. Inflorescences congested-cymose, many flowered, glabrous or reddish brown hirtellous; peduncle 1.5-3 cm; axes helicoid. Flowers reportedly distylous, subsessile or on pedicels to 1 mm. Calyx glabrous; hypanthium submitriform, 1.5-2 mm; lobes with 1 gland in each sinus. Corolla red or purplish red, subtubular, glabrous outside; tube 22-24 mm, white hirsute above middle inside; lobes ovate-triangular, 3(-6) mm. Capsules drying red, mitriform, 10-11 mm wide. Fl. Jun.
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