Herbs perennial. Rhizomes black, ligneous. Stems 40-50(-65) cm tall, branched at base, glabrous, slenderly striate, leafless above. Petiole 2-4 cm; leaf blade broadly ovate or triangular, 2-3 × 1.5-2.5 cm, both surfaces glabrous, veins rather prominent abaxially, base broadly cordate or nearly truncate, apex acute; ocrea membranous, oblique, margin not ciliate, apex acute. Inflorescence of several spikes aggregated and panicle-like, lax; bracts funnel-shaped, each 2-or 3-flowered. Pedicels longer than bracts, 2-2.5 mm, slender, apex articulate. Tepals elliptic, 1-1.5 mm. Stamens equaling perianth. Styles free; stigmas capitate. Achenes shiny, ovoid, 2-2.5 mm. Fl. Jul-Oct, fr. Aug-Nov.
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