Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
3. Cyperus L. -- Galingale, umbrella sedge3. Cyperus bipartitus Torr. -- Shining cyperus, brook cyperus
Very similar to C. diandrus, differing mainly as follows: Leaves and involucral bracts 0.5-2 mm wide. Scales of the spikelets closely overlapping, with the achenes usually completely hidden between them, 1.8-2.2 mm long, strongly pigmented (or some lacking pigment or only partially pigmented) with purplish-brown on the sides of the scales, usually darker toward the base, the green keel containing the nerves; styles bifid, exserted less than 1 mm, deciduous, undivided in the lower 1/3. Late Jul--Sep. Sandy or muddy shores, stream banks and other wet places; uncommon in se ND, scattered s to NE where frequent; (ME and Que. to ND, s to GA, TX and s to S. Amer.; rare in w U.S.). C. rivularis Kunth
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