Cyperus diandrus 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 annual (0.5)1–2(–4) dm; cauline lvs often equaling the stem, to 3 mm wide; bracts usually 3, the lowest to 15 cm; rays 1–3, to 6 cm; spikelets 6–10, 8–15 × 2–3.5 mm; scales ovate, 2.5–3 mm, as seen from the side in half-view over 3 times as long as wide and obscurely acuminate, at maturity red-purple at the tip and in a tapering marginal band almost or quite to the base that is separated from the midrib by a colorless furrowed strip; stamens 2 (or 3 in upper fls); achenes lenticular, elliptic- obovate, 1–1.3 mm; style cleft almost to the base, persistent. Wet ground, especially along shores; Me. and Que. to N.D., s. to Va. and Io.