Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
2. Carex L. -- Sedge
42. Carex pseudo-cyperus L.
Tufted in large clumps from short rootstocks; culms stout, trigonous,
3-10 dm long, roughened. Leaves 5-15 mm wide; sheaths hyaline
ventrally, yellow-tinged dorsally. Spikes unisexual, the terminal one
staminate, 1.5-7 cm long; lateral spikes pistillate, 2-6, cylindric, 3-8 cm
long, ca. 1 cm thick, slender-peduncled, the lower ones drooping; bracts
much exceeding the inflorescence; pistillate scales with a very small
body, rough awned, the awn shorter to longer than the perigynium. Perigynia
spreading to reflexed, flattened-trigonous, slenderly ovoid, 4-6.2 mm long,
firm and shiny, strongly 12- to 17-nerved, tapering to the smooth beak which
is 1-1.5 mm long, the teeth 0.5-1 mm long, straight; achenes trigonous,
1.5-1.7 mm long; stigmas 3. Jul--Aug. Cold springs, bogs and swamps;
rare in ne and c ND; (Newf. to Sask., s to PA, IN, MN and ND).
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