Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
2. Carex L. -- Sedge17. Carex diandra Schrank
Densely tufted; culms sharply trigonous, 3-8 dm long, usually exceeding the leaves. Leaves 1-3 mm wide; sheaths pale-striate, white-hyaline ventrally or only slightly copper-tinged at the mouth, prolonged into a ligule 1-3 mm long. Spikes bisexual, androgynous, aggregate, continuous or nearly so in ovoid to subcylindric heads 1-4 cm long; bracts reduced, inconspicuous, usually shorter than the spikes; pistillate scales brownish, acute to cuspidate, about equaling the perigynia. Perigynia brown, shiny, unequally biconvex, deltoid-ovate, truncate-rounded at the base, 2-3 mm long, ca. 1/2 as wide, few-nerved dorsally, nerveless ventrally, tapering to the serrulate, entire to bidentulate beak which is 1/4 to 1/2 the entire length of the perigynium; achenes lenticular, ca. 1 mm long; stigmas 2. Jun--Jul. Wet meadows, springs and fens; rare, nc ND and nc and w NE; (Circumboreal, in N.Amer. s to NJ, IN, MO, NE, CO, UT and CA).
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