Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
5. Elocharis R. Br. -- Spikesedge, spikerush11. Eleocharis xyridiformis Fern. & Brackett -- Spikerush
Quite similar to E. macrostachya, differing chiefly as follows: Culms flattened and ribbonlike especially in the lower portion, some often twisted, 1-3.5 mm wide, tending to be yellow-green (rather than dark green); sheaths truncate at the apex. Spikelets oblong-ovoid to linear-cylindric, 7-27 mm long, 2-4 mm thick. Achenes 1.2-1.5 mm long excluding the tubercle, 0.9-1.2 mm wide; tubercle 0.3-0.5 mm long, 0.4-0.5 mm wide. Jun--Aug. Shores and shallow water of lakes, ponds and marshes; frequent mainly in the c and w parts of the region; (ND and MT s to TX and into Mex.).
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