Northern Prairie Wildlife Research Center
Aquatic and Wetland Vascular Plants of the Northern Great Plains
62. Cyperaceae, the Sedge Family
5. Elocharis R. Br. -- Spikesedge, spikerush
4. Eleocharis macrostachya Britt. -- Spikerush
Quite similar to the preceding but more robust; culms 1.5-10 dm tall,
1-3 mm thick; sheaths reddish or purplish toward the base, usually firm,
truncate to oblique at the orifice. Spikelets ovoid to lance-cylindric,
acuminate to rather blunt, 5-25 mm long, 2.5-4 mm thick; sterile basal scales
2(3); floriferous scales as in the preceding; perianth variable;
styles bifid. Achenes yellow to brown, biconvex, 1.4-1.7 mm long
excluding the tubercle, 1-1.2 mm wide; tubercle thick, deltoid, 0.5-0.7
mm high, 0.4-0.75 mm wide, constricted at the base. Jun--Aug. Same habitats
as the preceding, often dominant in shallow marsh zones; common, often abundant;
(IL to AK, s to MO, TX, CA and into Mex.). E. palustris (L.) R. & S.
Previous Section -- Eleocharis erythropoda Steud.
Return to Family -- Cyperaceae - The
Next Section -- Eleocharis obtusa (Willd.) Schult.
-- Blunt spikesedge