Cyperus polystachyos Rottb.
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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 annual 2–6 dm; lvs 1–3 mm wide, shorter than the stem; bracts 3–5, the largest 5–18 cm; umbel with 1–6 rays to 6 cm, or the spikes all sessile; spikelets 10–15, 8–15 × 1–1.8 mm; scales stramineous, oblong, 1.5–2.3 mm, subacute; stamens 2; achenes lenticular, black, oblong, 1 mm, half as wide. Wet soil, mostly near the coast; pantrop., extending n. to Mass. and in the interior to Mo. Our plants are var. texensis (Torr.) Fernald. (C. gatesii; C. microdontus; C. paniculatus)