Eleocharis macrostachya Britton

Eleocharis macrostachya Britton; Small. Fl SE. U. S. 184. 1903.
Eleocharis mamillata of authors, not E. mamillata Lindb. f. .
Eleocharis calva of authors (as to plants of western United States and Hawaii), not h. calva
Eleocharis palus'tris australis Nees, Nova Acta Acad. Leop.-Carol. 19 (Suppl. 1) : 96. 1843.
Scirpus^nudissimus Steud. & Jardin, Bull. Soc. Linn. Norm. II. 9: 278, 280. 1875. Nomen
subnudum. (Hawaii.) ,^ ,., • n
Eleocharis perlouga Fernald & Brackett, Rhodora 31 : 70. 1929. (California.) ^ ,^ . ^
Eleocharis xyridiformis Fernald & Brackett, Rhodora 31 : 76. 1929. (Valley of Mexico.)
Loosely stoloniferous or subcespitose ; culms filiform to 3 mm. wide, usually prominently striate, soft to rigid, frequently flattened, or spirally twisted; sheaths orange to dark red, loose, often truncate and mucronate at the apex; spikelets lanceolate (rarely ovate) to acuminate, pale brown to nearly black, fewor many-flowered, the scales usually remaining appressed at maturity; lower scale frequently encircling the culm; fertile scales lanceolate, firm, acute, scarcely hyaline at the apex, usually with a pale midrib and brown to black margins; anthers 1.5-2.0 mm. long; achenes obovate, glistening yellow when immature, becoming dark brown, averaging 1.8 mm. long (not including the depressed-deltoid to lanceolate tubercle), and 1.0 mm. wide; bristles slender, variable in length.
Type locality: "Indian Territory" (Oklahoma).
Distribution: Minnesota, Iowa, Missouri, Illinois (Bluff Lake, Eggert), and Te^as, west to Alberta, British Columbia, and California, northward along the coast to southern Alaska ; northward in the interior of Canada to Great Slave Lake ; northern and central Mexico ; El Valle, Colombia, Cuatrecasas 20871) Argentina; Uruguay.