Eleocharis palustris var. vigens L. H. Bailey

Eleocharis smallii Britton, Torreya 3 : 23. 1903
Eleocharis palustris var. vigens L. H. Bailey; Britton, Jour. N. Y. Micr. Soc. 5: 104. 1889. Trichophyllnm palustre var. vigens House, Am. Midi. Nat. 6: 205. 1920.
Loosely stoloniferous to subcespitose ; culms usually firm or wiry, to 1 m. high, 0.5-5 mm. wide ; sheath firm, usually with a prominently blackened apex and sinus ; spikelets narrowly lanceolate, frequently becoming ovate and loosely-flowered in age, usually acute, 0.5-2.0 cm. long; scales lanceolate, pale to dark brown, with rigid, acuminate, sometimes spreading tips, at the northern border of the range frequently of softer texture; anthers 1.5-2.0 mm. long; achenes obovoid, averaging 2.0 mm. long (excluding the depressed-deltoid to elongate tubercle) and 1.1 mm. wide, becoming dark brown in age; bristles variable.
Type locality : Harrisburg, Pennsylvania.
Distribution : Labrador and Newfoundland to Manitoba, Minnesota, and eastern North Dakota, south to Delaware, western Virginia, West Virginia, Tennessee, Alabama, Indiana, Illinois, and Missouri.