Herbs 50--90 cm tall. Petiole without a green margin; leaf blade oblong-lanceolate, broadly lanceolate, or oblanceolate, (6--)10--20(--22) X (2--)3--4(--5) cm including petiole, thin, base attenuate, apex usually acuminate. Inflorescences paniculate, rachis 2 or 3 X branched; branches terete to slightly compressed, obtusely angled, without wings, never conspicuously 2-or 3-angular; spikes with 7--11 densely arranged spikelets; spikelet 3-or 4-flowered; bracts broadly ovate, 7--8 mm, apex 1-cuspidate; first bractlet similar to bract but apically 2-or 3-cuspidate. Calyx 7--8 mm, tube ca. 1 mm in diam.; lobes entire, apex acute, veins dark purple and sometimes yellowish, and never reaching middle of limb. Corolla purple. Fl. Jun-Jul, fr. Jul-Aug.
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