Plants perennial, glabrous or nearly so, with fusiform, vertical rootstock. Stems erect, branched in distal 2, 40-85(-100) cm. Leaves: ocrea deciduous or par-tially persistent at maturity; blade oblong-lanceolate to lanceolate, 20-35 × 5-12 cm, base cordate to broadly cuneate, margins entire or nearly so, flat, apex acute or attenuate. Inflorescences terminal, occupying distal 2-3 of stem, interrupted in proximal 1/ 2, paniculate, branched. Pedicels articulated in proximal 1/ 3, filiform, 12-20 mm, 3-4 times as long as inner tepals, articulation weakly evident, not swollen. Flowers 10-20 in whorls; inner tepals ovate-triangular, 4-5(-6) × 3-4(-5) mm, base truncate to subcordate, margins entire, apex acute to subacute; tubercles absent. Achenes brown, 3 × 1.5 mm. 2n = 120.
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