Perennial 6–12 dm, glabrous to the silky calyces, freely branched into a diffuse panicle of loose spikes; lfls mostly 5–13, glaucous, 4–11 mm, narrow; spikes 5–30-fld, the fls ± 2-ranked; bracts broadly ovate to obovate or truncate, enfolding and eventually falling with the cal; fls of subg. Parosela, white, 6–8 mm; cal-tube 3–3.5 mm, the triangular-aristate teeth 3.5–4.5 mm, very plumose, eventually spreading; stamens 9; fr 3–4 mm; 2n=14. Dry prairies and hillsides; w. Io. and w. Mo. to Mont., Colo., and N.M. July, Aug. (Parosela e.)
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