CYrEKACK.lI. (3KDGE FAMILY.) 515 



Spikes small ; perigynia thick and spongy at the base, and ivith a rigid margin, 

 not dilated. 



= 



33. C. Stellial&ta, Good. Spikes 3-5, distinct, obovoid or roundish at 

 maturity; perigynia ovate from a broad somewhat heart-shaped base, widely 

 spreading at maturity, longer than the ovate acute scale ; achenium ovate, ab- 

 ruptly contracted into a minute stalk; style slightly tumid at the base. Var. 

 ficiRPOiDES has smaller more approximate spiffs, the perigynia ovate from a 

 rounded or truncate base, narrower and less acute scales, and a very short style. 

 (C. scirpoides, Schk.) Var. STERILIS has the spikes occasionally dioecious, or 

 thy staminate ones with but few fertile flowers, and the pistillate nearly destitute 

 of barren ones; the culms stouter and rigidly erect; and the leaves generally 

 glaucous; achenium rounder, with a more tapering base, and the style scarcely 

 tumid at the base. (C. sterilis, Schk.) Var. ANGUST\TA has about 4 aggre- 

 gated spikes, with narrow/..!/ lanceolate perigynia tapering into a long slightly rough 

 beak, more than twice the length of the blunt scale ; the achenium oblong. 

 Swamps and wet meadows; common, especially northward. (Eu.) 



- <- Spikes rather large: perigynia thickened and spongy on the angles, with a more 

 or less dilated membra naceous margin or wing. OVALES. 



34. C. syclMlOCeplmla, Carey. Spikes densely clustered, forming a short 

 compound spiked head subtended by 3 very long unequal leafy bracts ; perigynia taper- 

 ing from an abruptly contracted ovate base into a long slender beak, somewhat ex- 

 ceeding the lanceolate abruptly mucronate scale. (C. cyperoides, Dew., not 

 of L.) Jefferson County (Vasey - Knieskern) and Little Falls, New York, 

 Vasey. Different in habit from all the rest of this section, and recognized at 

 once by the ovoid compound spike, seated at the baso of the long leafy bracts, 

 by which the lowc.r spikes are partly concealed. 



35. CJ. ai'iila, Schw. & Torr. Spikes 8-10, approximate ($' long), (Along- 

 cylindrical, contracted at each end; perigynia narrowly lanceolate (4-5 lines in 

 length), tapering into a long beak more than twice the length of the ovate-lanceolate 

 scale; aehenium sessile, narrowly oblong. (C. Muskingumensis, Schw.) Wet 

 meadows, Ohio and Michigan to Illinois and Kentucky. In its characters scarce- 

 ly distinguished from the next, but strikingly different in appearance ; a much 

 larger plant, with long, dry, and chaffy-looking spikes. 



36. C. SCOpfsria, Schk. Spikes 5 - 8, club-shaped, at length ovate, more 

 less app'-oxim ate, sometimes forming a dense head; perigynia narrowly lanceo- 



late, tapering into a long slender beak, longer than the lanceolate pointed scale ; ache- 

 nium distinctly stalked, exactly oval. Low meadows ; everywhere common. 

 Spikes brownish 01 straw-colored when ripe. 



37. C. lagopodioides, Schk. Spikes 10-15, approximate; perigynia 



orate-lanceolate, nearly twice the length of the ovate-oblong rather obtuse scale ; aehe- 

 nium narrowly oval, on a short stalk. Var. CRISTATA has the spikes closely 

 aggregated, with the perigynia spreading. (C. cristata, Schw. fr Torr.) "Wet 

 fields ; equally common with the last, from which it is distinguished only by the 

 more numerous shorter spikes, and shorter less tapering perigynia and scales. 

 The variety has the spikes crowded into an ovate head, to which the diverging 

 points of the fruit give a squarrose appearance. 



