Herbs 50-100 cm tall. Stems 4-sided, winged on angles, with small white spots, glabrous. Petiole 2.5-5.5 cm, white-spotted; leaf blade oblong-lanceolate to elliptic, 13-21 × 5-6.7 cm, abaxially furfuraceous squamose, adaxially glabrous and often with white spots near base, secondary veins 2 on each side of midvein, base cuneate, margin ciliate and entire or sparsely serrulate, apex acuminate. Inflorescences terminal, umbellate, many-flowered; peduncle (2.5-)4-7.5 cm, winged; bracts broadly obovate, ca. 1.6 × 1 cm, caducous, densely furfuraceous squamose. Pedicel ca. 5 mm but to 9 mm in fruit, glabrous. Hypanthium funnel-shaped, ca. 1.2 cm, 8-ribbed, glabrous. Calyx lobes triangular-ovate, ca. 4 mm, base subauriculate, apex obtuse. Petals white, elliptic (in bud), ca. 8 mm, oblique. Longer stamens (in bud) with filament ca. 5 mm; anthers linear, ca. 8 mm, base lengthened and forming a forked spur; connective minutely bulged. Shorter stamens ca. 5 mm; anthers oblong, ca. 2 mm. Ovary inferior, 4 lobed, apex with a membranous crown. Capsule campanulate, ca. 6 mm in diam., apex 4-lobed, crown exserted ca. 1.5 mm beyond calyx; hypanthium 8-ribbed, glabrous. Fl. May, fr. Jul.
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