CYPERACEAE. 
73. Carex viréscens Muhl. Downy Green 
Sedge. (Fig. 743.) 
Carex virescens Muhl.; Willd. Sp. Pl. 4: 251. 1805. 
Culms very slender, erect or somewhat reclining, 
rough above, 6’-18/ tall. Leaves light green, pubes- 
cent, especially on the sheaths; spikes 2-5, very short- 
stalked, erect or nearly so, oblong-cylindric, densely 
many-flowered, 4’’-10’’ long, about 114’’ in diameter, 
the terminal one staminate below; perigynia 3-sided, 
broadly oval or ovoid, rather less than 1/’ long, as- 
cending, densely pubescent, few-nerved, green, beak- 
less, the orifice entire; scales oblong-ovate, cuspidate 
by the excurrent midvein, scarious-margined, slightly 
shorter than the perigynia; stigmas 3. 
In dry woods and thickets, Maine and Ontario to Michi- 
gan, south to North Carolina and Missouri. Ascends to 
2000 ft. in Pennsylvania. June-July. 
74. Carex costellata Britton. Ribbed Sedge. (Fig. 744.) 
Carex costata Schwein. Ann. Lyc. N. Y. 1:67. 1824. ; 
Not Presl. 1819. Lo LDN | 
Carex virescens vat. costala Dewey, Am. Journ. Sci. / . 
9: 260. 1825. 
C. costellata Britton, Bull. Torr. Club, 22: 223. 1895. 
Similar to the preceding species, but taller and 
more spreading; culms slender, 1°-214° long. i 
Leaves 114//-2/’ wide, pubescent, especially on 
the sheaths, shorter than the culm, the upper one 
and the similar lower bract sometimes overtop- 
ping the spikes; spikes 2-5, narrowly cylindric, 
many-flowered, rather loose, 14/-114’ long, 114’ 
in diameter, erect or slightly spreading, the termi- 
nal one staminate below, the lower one commonly 
filiform-stalked; perigynia oblong, densely pu- 
bescent, narrowed at each end, strongly several- 
ribbed, 1/” long, rather more than 4’ thick, 
beakless, the orifice entire; scales ovate, scarious- / 
margined, acuminate or cuspidate, shorter than / 
the perigynia; stigmas 3. 
In woods, Maine and Ontario to North Carolina, where it ascends to 4ooo ft. June-Aug. 
75. Carex triceps Michx. Hirsute Sedge. (Fig. 745.) 
Carex triceps Michx, Fl. Bor. Am, 2:170. 1803. 
Carex hirsuta Willd. Sp. Pl. 4: 252. 1805. 
Carex triceps var. hirsuta Bailey, Mem. Torr. Club, r: 
35. 1889. 
Light green, culms slender, rough above, erect 
or reclining, 67-334° long. Leaves 1//-2’’ wide, 
pubescent, at least on the sheaths, shorter than the 
culm, the lower bract similar; spikes 2-5, oblong 
or oblong-cylindric, dense, erect, sessile or very 
nearly so, 3//-8’’ long, 214’/-314’’ in diameter, 
usually clustered at the summit, the terminal one 
staminate at the base; perigynia oval or obovoid, 
flattened, not inflated, green or greenish-brown, 
few-nerved, imbricated, usually pubescent when 
young, when mature '%4//-1’’ long, beakless, the 
orifice minutely notched or entire; scales ovate, 
scarious-margined, cuspidate or short-awned, rather 
shorter than the perigynia; achene elliptic-obovoid, 
its summit not bent; stigmas 3. 
In woods, fieldsand swamps, Massachusetts to southern Ontario and Michigan, south to Florida 
and Texas. Ascends’ to 2500 ft. in Virginia. April-Aug. 
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