Carex. CLX. CYPERACEZ. 56a 
bifid, concavo-convex, scabrous on the margin, longer than the oblong, lanceo- 
late glume; st. 1—3f high, acutely triangular—Plant yellowish-green. Com- 
mon in fields and meadows on colder soils. 
38. C. TENUIFLORA. Wahl. 
Spikelets 2—3, ovate, clustered, sessile, alternate, lower one bracteate; 
perig. ovate-oblong, acutish, plano-convex, equaling the oblong-ovate, hyaline 
or white glume; s¢. a foot or more high, slender, subprostrate, longer than the ~ 
flat and narrow leaves.—Light green. Spikelets whitish. Burlington and 
Salem, Vt., in swamps, Robbins, Oriskany and Ogdensburg, N. Y., Kneirskern, 
Southampton, Mass., Chapman. 
39. C. CYPEROIDES. 
Spikelets ovate, closely aggregated into a head, with long and leafy bracts; 
perig. ovate, long-lanceolate, or drawn into a long awn scabrous on its edges, 
slightly stipitate, 2-toothed, a little longer than the lanceolate and cuspidate 
glume ; plant very pale green.—Jefferson Co., N. Y.—first found in our country 
last summer, by Dr. Crawe. 
40. C. Musxineumensis. Schw. 
Spikelets oval-oblong, 5—10, somewhat tapering at both ends, large and 
approximate, close-flowered, dry and chaff-like; perig. lanceolate, compressed, 
thin, distinctly winged, bidentate, nerved, acuminate, twice longer than the 
ovate-lanceolate glume; plant light green in all its parts—Common in Ohio 
and Mich., 18—36’ high. 
41. C. Lippont. Boott. 
Spikelets 5—7, oblong-ovate, closely aggregated; perig. ovate, lanceolate, 
acuminate, oblique at the orifice, glabrous, on the margin serrulate, scarcely 
longer than the ovate-lanceolate glume, which is acute and hyaline on the edges; 
perig. and glumes rather chestnut brown; plant yellowish-green.—Arctic Am., 
Boott, Mich., Dr. Cooley. 
C. Stamens and Stugmas on separate spikes. 
1. Staminate spike single. 
42. C. aurea. Nutt. (C. pyriformis. Schw.) 
d& Spike short, cylindric, pedunculate; Q spikes 3, oblong, loose-flowered, 
subpendulous, exsertly pedunculate, subapproximate, bracteate ; perig. globose, 
obovate or pear-form, obtuse, nerved, entire at the mouth, longer than the ovate, 
acute or short-mucronate glume; s¢. 3—10’ high, slender, often subprocumbent. 
—Plant glabrous, green. Common in wet grounds. : 
43. C. SAXaTILIS. 
3 Spike oblong, thick; Q spikes 2 or 3, oblong, obtuse, sessile, lower pe- 
dunculate; perig. elliptic, plano-convex, obtuse, short-rostrate, about equaling 
the oblong and obtuse glume ; st. 6—10’ high, erect, with long and leafy sheaths 
ane eee nearly black. White Mts., N. H., Barratt; woods, Vt., 
Pursh. 
44. C. concotor. R. Br. 
oS Spike erect, cylindric; Q spikes 2—3, erect, subsessile, cylindric ; perig. 
oval, entire, smooth, mucronate, about equal to the oblong and obtuse glume; 
st. 10—15’ high, smooth, leafy below; bracts auriculate; g spike sometimes 
pistillate above-— White Mts., N. H., Boott. Closely related to C. cespitosa, L., 
but has a smooth stem; scales of light color. 
2. Staminate spikes one or more, and the upper part of the pistillate sometimes 
staminate. 
45, C. ricgipa. Good. 
3 Spike oblong, cylindric, rarely 2; spikes 2—3, oblong, cylindric 
densely-flowered, short and thick, ape ower one * ubpadicollatie with 
a bract surpassing the stem ; perig. ovate, obtusish, entire at the orifice; glwme 
nearly twice longer than the mature fruit and subequal before; st. 3—8’ high, 
thick and stiff, often recurved ; ls. stiff and glaucous.—Ipswich, Ms., Oakes. 
Has been confpounded with C. cespitosa. 
