Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
2. Carex L. -- Sedge
48. Carex sterilis Willd.
Very similar to C. interior, differing mainly as follows: Leaves
1-4 mm wide. Spikes 3-7; pistillate scales acute to cuspidate,
about equaling the perigynium body. Perigynium beak prominent, rough,
ca. 1/3 the length of the entire perigynium, the teeth sharp, 0.3-0.5 mm long.
Late May--Jul. Fens and permanently wet meadows; rare, with records from McHenry
Co., ND; (Newf. to ND, s to NJ and IL). C. muricata L. var. sterilis
(Carey) Gl.