CAREX. CLX. CYPERACEJ2. 583 



II. Stigmas three. 



D. Spikes androgynous. Monoecious. 



! Stamens at the summit. 



a. Spike single. 



53. C. POLYTRicHolDEs. Muhl. (C. microstachya. MX.} 



Spike oblong, terminal ; perig. 38, oblong, alternate, subtriquetrous, gla- 

 brous, emarginate, twice longer than the ovate and obtuse, and rarely mucro- 

 nate glume ; st. 4 12' high, very slender, with setaceous and subradical leaves. 

 Common in wet and cold grounds. 



54. C. LENEOGLOCHIN. Ehrh. (C. pauciflora. Lightfoot.} 



Spike about 4-flowered, with 1 or 2 ^ flowers at the apex ; perig. lanceo- 

 late, subtriquetrous and tapering, much reflexed, twice longer than the oblong- 

 lanceolate glume; st. 3 8' high, with subradical and linear leaves. In Ashfield 

 and Hawley, Mass., in a marsh, Porter. 



fot One or more radical -peduncles with a single spike. 



55. C. PEDUNCULATA. Muhl. 



Spikes about 5, 3-sided, distant, long, recurved, pedunculate; perig. obo- 

 vate, triquetrous, recurved at the apex, commonly glabrous, a little longer than 

 the oblong or obovate, mucronate glume; st. 4 12' high, triangular, rather 

 procumbent; sta. sometimes removed a little from the 9 spike. Common in 

 woods. Flowers early in the spring. 



56. C. WILLDENOWII. Schk. 



Sts. or radical ped. 1 3 ; spike commonly single, stameniferous above, or 

 the stamens removed a little ; perig. 3 6, alternate, loose, oblong and inflated a 

 little, tapering at the base and conic-rostrate above ; 9 glumes ovate and acute, 

 the lower ones long and leaf-like, much surpassing the stem. On dry grounds, 

 common throughout the U. S. One variety has the tf spike distinct ; another 

 is destitute of the long and leafy scales, and is frequent at the North as well as 

 in Flor. 



57. C. STENDELII. Kth. 



Sts. or radical ped. 1 8' long; spike commonly single, stameniferous 

 above; perig. 1 4, subglobose or ellipsoid and inflated, alternate, stipitale, 

 terete and conic-rostrate, with an oblique orifice ; 9 glumes usually long and 

 leafy ; Ivs. smooth, soft, narrow, longer far than the stems. Jefferson Co., N. Y., 

 and in Ohio and the Western States. 



58. C. BACKII. Boott. 



Ped. radical, 1 4f high, stiff, thick or layge ; spike single, commonly sta- 

 meniferous above, short ; perig. ovate, globose, smooth, conic-rostrate, entire at 

 the orifice, when mature pear-shaped, the beak articulated to the fruit ; 9 glumes 

 usually long and leaf-like, enclosing the fruit ; Ivs. radical, flat, thick, rough or 

 scabrous and short. Jefferson Co., N. Y. and Arctic Am. The three preceding 

 species are closely related, and yet look very different. 



2. Spikes staminate at the base. 

 c. Spikes one, often more. 



59. C. SQXJARROSA. 



Spikes 1 4, oblong, cylindric, obtuse, upper one attenuated below at first 

 by the decurrent, $ flowers, all very densely flowered ; perig. ovate, subglobose, 

 long-rostrate, 2-toothed, horizontal, glabrous and subsquarrose, longer than the 

 lanceolate glume ; st. 1 2f high, slender for the large spike or spikes ; lower 

 spikes pedunculate. Large and fine. It is C. typhirea MX. when only one spike 

 is present. 



/?. ( C. typhinoides. Schw.) Spikes 2, the lower on a very long peduncle, and 

 both longer and smaller. 



E. Spikes dioecious. 



60. C. SCIRPOlDEA. MX. 



Spike oblong, cylindric, acutish ; $ glume oblong, obtusish ; perig. ovate, 

 (oval), subrostrate, pubescent, longer than the ovate, acutish glume, scarious 

 on the edge ; st. 4 10' high, erect ; Ivs. flat and long. White Mts., N. H., Oakes. 



