SEDGE FAMILY. 263 
4. Scirpus Clintoni A. Gray. Clinton’s Club-rush. (Fig. 612.) 
Scirpus Clintonit A. Gray, Am. Journ. Sci. (II.) 38: 290. 
1864. 
Perennial, culms tufted, triangular, very slender, 
erect, 4/-15’ tall, roughish on the angles. Lower 
sheaths imbricated, one or more of them bearing short 
subulate blades, the upper one bearing a flat, narrowly 
linear blade shorter than the culm; spikelet solitary, 
terminal, ovoid, few-flowered, 114’/-2’’ long, sub- 
tended by a subulate involucral bract of less than its 
own length or somewhat longer; scales ovate, pale 
brown, acute; bristles 3-6, filiform, upwardly barbed, 
as long as the achene or longer; style 3-cleft; achene 
oblong, brown, sharply 3-angled, smooth, obtuse. 
In dry fields and thickets, New Brunswick to western 
New York and Michigan, south to North Carolina. Local. 
June-Aug. 
5. Scirpus planifolius Muhl. Wood Club-rush. (Fig. 613.) 
Scirpus plantfolius Muhl. Gram, 32. 1817. 
Perennial, culms triangular, slender, tufted, rather 
weak, roughish on the angles, 6/-15’ tall. Lower 
sheaths bearing short subulate blades, the upper with 
a flat narrowly linear rough-margined leaf about as 
long as the culm; spikelet solitary, terminal, ovoid- 
oblong, acute, several-flowered, subtended by a short 
involucral bract; scales ovate-lanceolate, yellowish- 
brown with a green midvein, which is extended be- 
yond the acute apex into a sharp cusp; bristles 4-6, 
upwardly barbed, about equalling the achene; stamens 
3; style 3-cleft, pubescent; achene oblong, 3-angled; 
smooth, light brown, rather obtuse. 
In woods and thickets, Rhode Island to Delaware, 
western New York and Missouri. May-July. 
6. Scirpus subterminalis Torr. Water Club-rush. (Fig. 614.) 
Scirpus subterminalis Torr. Fl, U.S. 1:47. 1824. 
Perennial (?), aquatic, culms slender, terete, nodu- 
lose, 1°-314° long. Leaves slender, channeled, 6/—2° 
long, ¢’/-34’’ wide; spikelet solitary, terminal, ob- 
long-cylindric, narrowed at each end, several-flow- 
ered, 3//-5’’ long, subtended by a subulate erect invo- 
lucral leaf %4’-1’ long, thus appearing lateral; scales 
ovate-lanceolate, acute, membranous, light brown 
with a green midvein; bristles about 6, downwardly 
barbed, as long as the achene or shorter; stamens 3; 
style 3-cleft to about the middle; achene obovoid, 3- 
angled, dark brown, smooth, rather more than 1/’’ 
long, obtuse, abruptly beaked by the slender base of 
the style. 
In ponds and streams or sometimes on their borders, 
New Brunswick to the Northwest Territory and Wash- 
ington, south to New Jersey, Pennsylvania and Michigan. 
The so-called variety /errestris is an emersed form with 
erect culms and shorter spikelets. July—Aug. 
