Herbs 50-80 cm tall. Roots slender. Stem erect, purple-red, 7-10 mm in diam. at base, hollow, glabrous; nodes inflated. Basal leaves 1-3; petiole purple-red, ca. as long as blade, subterete, glabrous or pilose near blade; leaf blade purple-red abaxially, dark green adaxially, broadly cordate or cordate, 13-20 × 12-19 cm, abaxially pubescent, adaxially glabrous, basal veins usually 5, base cordate, margin entire, apex acuminate or long acuminate, rarely obtuse. Stem leaves 1-3, smaller upward, broadly ovate to ovate-cordate; ocrea ca. 2 cm, glabrous or muricate, scarious when dry, clasping. Panicle usually 2-branched at middle, sparsely arranged, glabrous. Pedicel ca. 3 mm, slender, jointed below middle. Flowers nearly 10-fascicled. Tepals 6, purple-red, outer 3 smaller, broadly elliptic, ca. 1.8 × 1.3 mm; inner 3 orbicular or broadly ovate, 2-2.5 mm. Stamens shorter than perianth; filaments purple-red, ca. 2 mm; anthers black-purple. Ovary rhomboid-ellipsoid; style short; stigma large. Fruit oblong-ovoid or broadly ovoid, 7-8 × 6.5-7 mm; wings purple-red when fresh, narrow, with longitudinal veins near middle. Seeds brown, ovoid or narrowly ovoid. Fl. Jun-Jul, fr. Aug-Sep.
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A herb. It grows to about 1 m high. The lower leaves are 15-30 cm long and wide. They are oval and taper to a short tip. The base is heart-shaped. They are hairy underneath. The upper leaves are smaller. The flowers are red. They occur in loose flower clusters in the axils of leaves or at the ends of branches. The fruit is dry and round and notched at the base and tip.
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