Herbs to 1 m tall, erect, unbranched. Stem brown, ca. 4 mm in diam., hairy. Petiole 0.8-2.5 cm; leaf blade elliptic, ovate-lanceolate, oblanceolate, or lanceolate, 9-23 × 2-4.5 cm, abaxially glabrescent or brown pubescent along veins, adaxially glabrous, secondary veins 5-8 on each side of midvein and netted near margin, tertiary veins inconspicuous, base rounded to subcordate, margin slightly spinose-dentate but sometimes inconspicuously dentate or occasionally entire, apex acute. Inflorescences terminal spikes, to 16 cm, 4-ranked; rachis grayish pubescent; bracts ovate to obovate, 1-1.5 × 0.5-0.8 cm, abaxially pubescent, palmately veined, base rounded, margins apically spiny, apex acute to acuminate; bracteoles lanceolate to oblanceolate, 1.3-2 × 0.2-0.4 cm, abaxially pubescent, base rounded, margin entire and ciliate, apex rounded with a short tip. Calyx ca. 2 cm, pubescent; lobes unequal, margin ciliate, anterior lobe ca. 1.7 × 0.4 cm, lateral lobes lanceolate and ca. 15 × 2.5 mm, posterior lobe oblong-lanceolate and ca. 2 × 0.5 cm. Corolla white, ca. 2.1 cm, villous; lobes orbicular, ca. 5 × 5 mm, apex emarginate. Staminal filaments ca. 8 mm, glabrous, upper pair curved (S-shaped); anther theca ca. 4.5 mm, pilose. Ovary ca. 3 mm; style ca. 1.1 cm. Capsule ca. 10 × 3 mm, glabrous. Seeds reniform, ca. 2 × 2.5 mm, glabrous. Fl. Feb-May, fr. Aug-Sep.
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