252 CYPERACEAE. 
Eleocharis palustris glaucéscens ( Willd.) A. Gray, Man. Ed. 5, 558. 1867. 
Scirpus glaucescens Willd. Enum. 76, 1809. 
Culms slender or nearly filiform, 8’-18' tall; spikelet oblong, 2'’-5’’ long; achene smaller; 
tubercle narrower. In wet meadows and marshes, range nearly of the type in North America. 
Perhaps a distinct species. 
The so-called variety calva is a form without bristles. 
Eleocharis palustris Watsoni Clarke, Britten’s Journ. Bot. 25: 268. 1887. 
Eleocharis Watsoni Bab, Ann. Nat. Hist. (II.) 5:10. 1852. : 
Culms stout, 6’-10’ tall; spike ovoid; scales dark purple-brown. Labrador and Prince Edward 
Island to Hudson Bay. . 
11. Eleocharis acicularis (l).) R. & S. Needle Spike-rush. (Fig. 587.) 
Scirpus acicularis I,. Sp. Pl. 48. 1753. 
Eleocharis acicularis R. & §. Syst. 2: 154. 1817. 
Perennial by filiform stolons or rootstocks, 
culms tufted, finely filiform or setaceous, 
obscurely 4-angled and grooved, weak, erect 
or reclining, 2’-8’ long. Sheaths truncate; 
spikelet compressed, narrowly ovate or lin- 
ear-oblong, acute, broader than the culm, 3- 
10-flowered, 114’’-3’’ long, 14’’ wide; scales P 
oblong, obtuse or the upper subacute, thin, 
pale green, usually with a narrow brown 
band on each side of the midvein, deciduous, 
many of them commonly sterile; bristles 3- 
4, fragile, fugacious, shorter than the achene; 
stamens 3; style 3-cleft; achene obovoid- 
oblong, pale, obscurely 3-angled with a rib 
on each angle and 6-9 lower intermediate 
ribs connected by fine ridges; tubercle conic, 
acute, one-fourth as long as the achene. 
In wet soil, throughout North America, ex- 
cept the extreme north. Also in Europe and 
Asia. Sometimes entirely sterile. July-Sept. 
12. Eleocharis Wolfii A. Gray. Wolf's 
Spike-rush. (Fig. 588.) 
Scirpus Wolfit A. Gray, Proc. Am, Acad. 10: 77. 1874. 
Eleocharis Wolfiit A. Gray; Britton, Journ. N. Y. 
Micros. Soc. 5: 105. 1889 
Perennial by short rootstocks, culms very slen- 
der, erect, flattened and 2-edged, 8’-18’ tall. Upper 
sheath oblique, scarious, hyaline-tipped; spikelet 
oblong or ovoid-oblong, terete, acute, thicker than 
the culm, 2’/-3’ long, nearly 1/’ in diameter; 
scales ovate, obtuse or the upper acute, thin, pale 
green with purplish-brown bands, tardily decidu- 
ous; bristles none (or perhaps early deciduous); 
style 3-cleft; achene obovoid, obscurely 3-angled, 
longitudinally 9-ribbed, the ribs transversely con- 
nected by minute ridges; tubercle depressed-conic, 
much shorter than the achene. 
In wet meadows, Illinois and Iowa. June-Aug. 
