Herbs 30-70 cm tall. Stems glabrous, or pubescent on nodes, 7-10 mm in diam. near base. Petiole of basal leaf subterete, 3-7 cm, papilliferous; leaf blade narrowly triangular or triangular-ovate, rarely narrowly ovate, 8-20 × 6-13 cm, abaxially shortly hispid, adaxially glabrous, basal veins 5, base cordate, margin slightly sinuolate, apex obtuse or acute. Stem leaves 1 or 2, very shortly petiolate, small; ocrea short, membranous. Panicles narrow, 2-branched only from lower part; bracts very small. Pedicel 2.5-3 mm, jointed below middle. Tepals light green with purple margin, broadly ovate. Fruit spherical, 8-9 mm in diam.; wings narrow, 1.5-2 mm wide, with longitudinal veins near middle. Seeds orbicular or ovoid, large, ca. 5 mm in diam. Fl. Jul-Aug, fr. Sep-Oct.
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