Carex. CLX. CYPERACEiE. 581 



bifid, concavo-convex, scabrous on the marp^in, longer than the oblon'^, lanceo- 

 late glume; 5/. 1 — 3f high, acutely triangular. — Plant yt-llowish-green. Com- 

 mon in fields and meadows on colder soils. 



38. C. tknl'iki,6ra. Wahl. 



S/nkrlcis 2 — 3, ovate, clustered, sessile, alternate, lower one bracteate; 

 perig. ovate-oblong, acuiish, plano-convex, equaling the oblong-ovate, hyaline 

 or white glume; $t. a loot or more high, slender, subprostrate, lunger than the 

 flat and narrow leaves. — Light green. Spikelets whitish. Burlington and 

 Salem, Vt., in swamps, Rabbins, Oriskany and Ogdensburg, X. Y., Kncirskcrn, 

 Southampton, Mass., Ckapmufi. 



39. C. CVPKUoiDES. 



Spi/iilcts ovate, closely aggregated into a head, with long and leafy bracts; 

 perig. ovate, long-lanceolate, or drawn into a long awn .scal)rous on its edges, 

 slightly stipitate, 2-tooihed, a little longer than the lanceolate and cuspidate 

 glume ; pl(i/U very pale green. — Jeller-son Co., N. Y. — first found in our country 

 last summer, by Dr. Crawe. 



40. C. Mu.sKiNGU.MENsis. Schw. 



SpiMcfs oval-oblong, 5 — 10, .somewhat tapering at both ends, large and 

 approximate, close-flowered, dry and chafl-like ; pcrig. lanceolate, compressed, 

 thin, distinctly winged, biaentatc, nerved, acuminate, twice longer than the 

 ovate-lanceolate glume; piafU light green in all its parts. — Common in Ohio 

 and Mich., 18— 3G' high. 



41. C. LiDDoNM. Boott. 



Spikrtcfs 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 ; 

 pcrig. and glumes rather chestnut brown ; plant yellowish-green. — Arctic Am., 

 Boott, Mich., Dr. Coolcy. 



C. Stamens and Sliginas on separate spikes. 

 1 • Stavdnate spike single. 



42. C, AUREA. Nutt. (C. pyriformis. Sckvj.) 



J* Spike short, cylindric, pedunculate ; 9 spikes 3, oblong, loose-flowered, 

 subpendulous, exsertly pedunculate, subapproximate, bracteate ; perig. globose, 

 obovate or pear-form, obtuse, nerved, entire at the moulh, longer than the ovate, 

 acute or short-mucronate glume; 5/. 3—10' high, slender, often subprocumbent. 

 — Plant glabrous, green. Common in wet grounds, 



43. C. SAXATir.is. 



(^ Spike oblong, thick ; 9 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 

 and bracts. — Spikes nearly black. White Mts., N, H., Barratt ; woods, Vt., 

 Pnrsh. 



44. C. coNcoLOR. R, Br. 



^ Spike erect, cylindric; 9 spikes 2—3, erect, sub.sessile, cylindric ; pcri^^. 

 oval, entire, smooth, mucronate, about equal to the oblong and 'obtuse glume ; 

 St. 10 — 15' high, .''mooth, leafy below ; bracts auriculate ; ^ spike sometimes 

 pistillate above. — White Mts., N. H., Boott. Clo.sely related to C. caspitosa, L., 

 but has a smooth stem ; scales of light color. 



2. Staminale spikes one or more, and the vppcr part of the pistillate sometimes 



staminatc. 



45. C. RiGiDA. Good. 



(^ Spike oblong, cylindric, rarely 2; Q spikes 2—3, oblong, cylindric, 

 densely-flowered, short and thick, approximate, lower one subpedicellate, with 

 a bract surpassing the stem ; perig. ovate, obtusish, entire at the orifice; srlume 

 nearly twice longer than the mature fruit and subequal before; .s/. 3 — 8' high, 

 thick and sti ft", often recurved; Ivs. .stiflf and glaucous.-— Ipswich, Ms., Oakcs. 

 Has been confpounded with C. cccspUosa. 



