132 CYPERACKAE 



87. C. concinna R. Br. Strongly stoloniferous; culms 5-15 cm. high; leaf- 

 blades 2-2,5 mm. wide; pistillate spikes 2-3, rather closely 4-10-flowered; scales 

 broadly ovate, hyaline-margined; perigynia densely pubescent, 3 mm. long, 

 nerveless. Dry soil: Que. — Sask. — Colo.— B.C. — ^Alaska. Mont,~Boreat Je- 

 Jl. 



88. C, concinnoides Mackenzie. Strongly stoloniferous; culms 25 cm. high 

 or less; leaf-blades 2-4 mm. wide; pistillate spikes 1 or 2, approximate^ rather 

 closely 5-10-fIowered; scales narrowly ovate, hyaline-margined; perigraia 2.5-3 

 mm. long. Dry soil: B.C. — Alta. — Mont.— Ida. — Calif. MonL My-Jl. 



89. C. Richardsonii R. Br. Strongly stoloniferous; culms 30 cm. high or 

 less; leaf-blades 2-4 mm. wide; pistillate spikes 2 or 3, approximate or the low- 

 est remote, rather closely 8-20-flowered; scales strongly hyaline-margined; 

 perigynia 2.5-3 mm. long. Dry soil: Ont. — N.Y.— III. — S.D.— Sask. MonL — 

 Boreal, My-Je. 



28. Albae Aschers. & Graebner. With long slender stolons. Culms very 

 slender, obtusely triangular, leafy near the base. Leaf-blades of the fertile culm 

 very narrow, involute. Terminal spike linear, staminate. Lateral spikes 2-3, 

 oblong or linear, loosely 4-8-flowered, all long-peduncled, linear or oblong, often 

 overtopping the staminate one. Bracts sheathing, subspathaceous, bladeless, 

 white-iyaline above. Scales white-hyaline, yellowish tinged. Perigynia erect, 

 obovoid, triangular, glabrous, nerved, tapering at the base, abruptly minutely 

 beaked, the orifice entire, hyaline. Achenes triangular, closely enveloped, the 

 sides concave. Style-base very short, bulbous-thickened, jointed with the 

 achene. Stigmas 3, long. 



90. C. eburnea Boott. Culms 1-3.5 dm. high; leaf-blades 0.5 mm. ^^\de or 



less; staminate spike sessile, 3-8 mm. long; perigynia membranaceous, obsoletely 



nerved, 2 mm. long, exceeding the scales. Dry sandy or rocky soil, especially 



limestone rocks: N.B.—Va.—Tenn.— Neb.— B.C.— Mack. Plain— Mont.; Boreal 

 My-Au. 



29. BicoLOREs Tuckerm. Stoloniferous. Culms central, slender, leafy 

 towards the base. Leaf-blades narrow. Basal sheaths light brown. Terminal 

 spike linear, staminate or occasionally gynaecandrous. Lateral spikes 2^, 

 pistillate, rather closely few-many-flowered in few ranks on erect exserted 

 peduncles. Bracts sheathing, not colored or dark-auricled, the blades elongated, 

 leaf-like. Scales reddish or purplish brown tinged. Perigynia ascending, 

 broadly oval or ellipsoid, circular in cross-section, nerved, glabrous, golden- 

 yellow or white-pulverulent at maturity, tapering or rounded at the base, essen- 

 tially beakless. Achenes lenticular, apiculate, closely enveloped. Style-base 

 slender, short, jointed with the achene. Stigmas 2. 



91. C. Hassei Bailey. Culms 1.5-6 dm. high; leaf -blades 2^ mm. wide; 

 pistillate spikes 6-20-flowered; scales usually purplish brown tinged; perigynia 

 2.5-3 mm. long, slightly pointed, less than 2 mm. wide; style becoming short- 

 exserted and somewhat persistent. River banks and wet rocks: Lab. — Me. — • 

 Pa.— Alta.— Utah— Calif.— Yukon. BorealSubmonL—Son. 



92. C. aurea Nutt. Cuhns 0.3-4 dm. high; leaf-blades 2-4 mm. wide; pis- 

 tillate spikes 4r-20-flowered; scales usually reddish brown tinged; perigynia 

 subumbonate, 2 mm. wide; style not exserted or persistent. Wet places: Newf. 

 —Conn.— Mich.— N.M.—Cahf.— B.C. Plain— Subalp. J^JL 



30. Paniceab Tuckerm. Stoloniferous. Cuhns central, slender, leafy 

 towards the base. Basal sheaths brownish or purplish tinged. Terminal 

 spike staminate, linear or Hnear-oblong. Lateral spikes 1-5, pistillate, loosely 

 to rather closely several-many-flowered, in few or several ranks, on erect, ex- 

 serted or included peduncles. Bracts sheathing, not colored or dark-auricled, 

 the blades developed. Scales purpUsh or reddish brown tinged. Perigynia 

 ascending or spreading, ovoid or obovoid, membranaceous, obtusely triangular, 

 slightly inflated, glabrous, pxmcticulate, Hght or olive green, pointed or beaked, 

 the orifice entire or nearly so. Achenes triangular. Style-base slender, con- 

 tinuous with achene. Stigmas 3. 



