SEDGE FAMILY 119 



Perig^Tiia densely or strongly pubescent. 



Xerves of the perigj-nia obscured bv pubescence, the teeth of beak short. 

 Leaf-blades flat, more than 2 mra. wide. 143. C. lanuginosa. 



Leaf-blades involute, 2 mm. wide or less. 144. C. lasiocarpa. 



Nerves of the perigj-nia prominent, the teeth of beak prominent, slender. 



145. C. Houghtonii. 

 B3ik of the perigynia including teeth nearly as long as body, the teeth 1.5 mm. long or 

 more. 

 Perig\-nia glabrous. 



Perigvnia ovoid, the teeth less than 2 mm. long, erect or spreadmg; scales acute 



to" aristate; leaf-blades glabrous. 146. C. laericonica. 



Perig.\-ma lanceolate or ovoid-lanceolate, the teeth 2—4 mm. long, widely spread- 

 ing; scales long-aristate; leaf-blades pubescent beneath. 



147. C. atherodes 

 Perigj-nia hairv. 148. C. Sheldonii. 



43. EXTEXSAE. 



Perigj-nia 2-3 mm. long, the beak scarcely half as long as the body. 



149. C. Tiridula. 

 Perigj-nia 4-6 mm. long, the beak about as long as the bodj*. 150. C. flara. 



44. Pacciflorae. 



Rhacheola present, conspicuously exserted; culms with many leaves. 



151. C microglochin. 

 Rhacheola absent or rudimentarv, not conspicuously exserted; culms with few leaves. 



152. C. pauciflora. 



45. PSET7DO-CYPERE.A.E. 



Perigj-nia suborbicular in cross-section, more or less inflated. 153. C. hystricina. 

 Perigvnia obtusely triangular, scarcelj- inflated, closely enveloping achene. 



154. C. comosa. 



46. PHTSOC.tRP.^JE. 



Perigj-nia scarcely inflated; beak entire or emarginate: stigmas normally two and achenes 

 lenticular. 

 Perigj-nia lanceolate: fertile culms fllamentose at the base; rootstocks creeping. 



155. C. miliaris. 

 Perigvnia ovoid; fertile culms rarelv if ever fllamentose at the base; plant loosely 



stbloniferous. 156. C. saiatilis. 



Perigj-nia from little to much inflated; beak bidentate; stigmas normally three and 

 achenes triangular. 

 PistiUate spikes globose or short-oblong, 5-15-flowered. 157. C. oligosperma. 



Pistillate spikes oblong to cj-lindric, 15-manj--flowere<l. 



Lower perigj-nia not reflexed; bracts moderatelj' exceeding the spikes. 



P^rigj-nia" ascending: lower sheaths more or less stronglj- fllamentose; culms 

 sharplj- triangular. 

 Perigj-nia 6-8 mm. long. 



Perigj-nia oblong-ovoid, tapering into the beak; spikes looselj- flowered 



at base. 158. C. Raeana. 



Perigj-nia ovoid or globose-ovoid, contracted into the beak; spikes more 

 closelj' flowered. 159. C. resicaria. 



Perigj-nia 8-10 mm. long, tapering into the beak. 160. C. exsiccata. 

 Perigj-nia spreading at maturitj-; lower sheaths not fllamentose; culms bluntlj- 

 triangular below the spikes. 161. C. rostrata. 



Ix)wer perigvnia reflexed; bracts many times exceeding the spikes. 



. 162. C. retrorsa. 



1. Xardixae Kiikenth. Very densely cespitose. Leaf-blades filiform. 

 Spike solitary, linear-oblong, androgj-nous, densely flowered, bractless. Peri- 

 gj-nia ascending, biconvex, elliptic-ovate, not inflated, the walls thin, glabrous, 

 striate, stipitate, the beak hj-aline-tipped, in age bidentulate. Achenes lenticular 

 or triangular. Stigmas 2 or 3. 



1. C. Hepbumii Boott. Culms 2-15 cm. high; sheaths strongly hj'ahne- 

 margined above, abrupth' contracted into the blades; spike 5-12 mm. long, with 

 1-10 perig\-nia; scales ovate, acutish, the midvein conspicuous; perigj-nia 3 mm. 

 long; achenes asually triangular. C. nardina Auth., in part. C. stantonensia 

 M. E. Jones. Drj' alpine slopes: Alta. — Colo. — Wash. — B.C. Alp. — Subalp. 

 Jl-Au. 



2. Inflatae Kiikenth. Cespitose, the rootstocks elongate. Leaf-blades 

 filiform. Spike soUtan.', ovoid, androg>-nous, densely flowered, bractless. 

 Perig\-nia inflated, the walls ver\- thin, slightly nerved, sessile, the smooth beak 

 hj'ahne tipped, obUquely cut, in age bidentulate. Achenes triangular. Stigmas 

 three. 



2. C. Engelmannii Bailej-. Culms 5-20 cm. high; leaf-blades about 0.5 

 mm. wide; spike with 15-40 ascending perigj-nia; scales l-nerved, acute to cuspi- 



