Plants perennial, normally gla-brous or very indistinctly papillose on veins of leaf blades abaxially, with fusiform, vertical rootstock. Stems erect, branched distal to middle, 80-150(-200) cm. Leaves: ocrea deciduous or partially persistent at maturity; blade lanceolate or oblong-lanceolate, normally 20-55(-70) × 2-7 cm, base cuneate, occasionally rounded or truncate, margins entire, flat to slightly crisped, apex acute. Inflorescences terminal, occupying distal 2 of stem, dense or interrupted in proximal 1/ 2, broadly paniculate, branches usually straight or arcuate. Pedicels articulated in proximal 3, filiform, 5-13 mm, articulation barely evident, not distinctly swollen. Flowers 15-25 in whorls; inner tepals orbiculate or orbiculate-ovate, rarely ovate-deltoid, 4-7(-7.5) × 3.5-7 mm, base truncate or slightly cordate, margins entire or weakly erose, flat, apex obtuse to subacute; tubercles 3, equal or subequal, normally less than 2 times as wide as inner tepals. Achenes usually reddish brown, 3-4.5 × 1.5-2.5 mm. 2n = 20.
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