Plants perennial, glabrous; with vertical rootstock, occasionally with short, creeping rhizomes. Stems erect or ascending, usually producing axillary shoots below 1st-order inflorescence or at proximal nodes, 30-60(-90) cm. Leaf blades light green to yellowish green, linear-lanceolate, occasionally lanceolate, 6-14 × 1-3.5(-4) cm, usually ca. 5-7 times as long as wide, widest near middle, thin, not coriaceous, base cuneate, margins entire, flat or undulate, apex acute or attenuate. Inflorescences terminal and axillary, terminal usually occupying distal 5-3 of stem, rather dense or interrupted in proximal 1/2, usually broadly paniculate (branches simple or with few 2d-order branches). Pedicels articulated in proximal 1/ 3 or almost near base, filiform (thickened distally), 4-7 mm, not more than 2-2.5 times as long as inner tepals, articulation indistinctly swollen. Flowers 10-20 in whorls; inner tepals broadly ovate-triangular, occasionally broadly triangular, 3.5-4.5(-5) × 3.5-4(-5) mm, base truncate or indistinctly cordate, margins entire or indistinctly erose, apex obtuse or subacute; tubercles 3, equal or subequal (much narrower than inner tepals). Achenes brown or dark reddish brown, 2-3 × 1.5-2 mm. 2n = 40.
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