Cyperus retrofractus (L.) Torr.
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Authority
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
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Family
Cyperaceae
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Scientific Name
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Description
Species Description - Tufted perennial, the cormose stem-bases joined by short rhizomes; stems rigid, 3–9 dm, acutely trigonous, antrorsely scabrous above, often smooth near the base; lvs 4–8, 3.5–8 mm wide, minutely rough-puberulent across the surface beneath and on the midrib above; bracts 3–12, the longest one at least as long as the longest ray; rays 4–13, glabrous, the longest 1–2 dm; prophylls smooth to ciliate; spikes obovoid or shortly obconic, 2–3 cm, less than twice as long as thick, the axis 10–22 mm; spikelets stramineous or dull greenish, often suffused with anthocyanin, 1–2(–4)-fld, subulate-acuminate, 8–10(–15) mm, crowded, the uppermost widely spreading or recurved, the others reflexed; scales closely appressed, lance-ovate, acute, (4–)4.5–5(–5.5) mm; achenes trigonously oblong, held between the hyaline wings of the rachilla for 3/4 their length. Pastures, roadsides, and other disturbed places; N.J. to Ga., w. to s. O., Mo., and Ark. (C. dipsaciformis)