Roots fasciculate. Rhizomes erect. Stem erect, 20-60(-100) cm. Leaves alternate, sometimes opposite, sessile, adaxially with numerous reddish brown spots, oblong-ovate to elliptic-lanceolate, 3-7(-10) × 0.7-2.5(-4) cm, base cuneate, margin entire or irregularly undulate and sparsely serrate distally, apex rounded. Cymes terminal and subterminal, densely branched, forming a flat-topped panicle, to 10 × 13 cm; pedicels 2-4 mm. Sepals lanceolate-triangular, 1-2 mm, apex acute. Petals erect, white or reddish, lanceolate-elliptic, 4-8 × ca. 1.8 mm, apex acute. Antesepalous stamens equaling or longer than petals; anthers yellow. Nectar scales rectangular-cuneate, ca. 1 mm, apex emarginate. Carpels free. Follicles erect, lanceolate-ellipsoid, base attenuate, apex shortly beaked. Seeds brown, narrowly oblong. Fl. Jun-Sep, fr. Aug-Sep.
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