Plants perennial, glabrous or indistinctly papillose-pubescent, with creeping horizontal rhizome. Stems erect, branched above middle (only in inflorescence), 50-100 cm. Leaves: ocrea deciduous or partially persistent at maturity; blade with large lateral veins alternating with short ones, oblong or oblong-lanceolate, 30-40(-50) × 10-12 cm, more than 3 times as long as wide, base broadly cuneate, truncate, or weakly cordate, margins entire or indistinctly repand, flat, apex obtuse or broadly acute. Inflorescences terminal, occupying distal 2 of stem, usually dense, narrowly paniculate. Pedicels articulated in proximal 1/ 3, filiform, 6-16 mm, articulation indistinct. Flowers 10-20 in whorls; inner tepals ovate-triangular or subcordate, 5-6 × 4.5-6 mm, widest at or near middle, base weakly emarginate, margins entire, erose, or indistinctly denticulate mostly at base, apex abruptly narrowed, acute or subacute; tubercles absent. Achenes deep brown to reddish brown, 2.5-4(-4.5) × 1.8-2.5 mm. 2n = 120.
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