Roots slender, fibrous. Stem erect, 50-100 cm. Leaves 3-5-verticillate; leaf blade oblong, 4-7.5 × 1.5-2 cm, base attenuate, margin with a few obtuse crenulations, apex obtuse to acuminate. Cymes terminal and axillary, in 2 or more widely spaced whorls, pedunculate, flat topped, to more than 30 cm × ca. 5 cm overall, densely many flowered; pedicels nearly equaling flowers. Sepals free, lanceolate, ca. 1 mm. Petals free, reddish, oblong, ca. 3 mm, base attenuate, apex obtuse, tip acuminate. Stamens equaling or longer than petals. Nectar scales oblong, ca. 0.8 × 0.4 mm. Carpels free. Follicles erect, oblong, ca. 4 mm, base attenuate, apex shortly beaked. Seeds few. Fl. Aug.
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