SEDGE FAMILY 123 



22. C, vulpinoidea Michx. Culms 3-9 dm. high, very rough above, exceeding 

 the leaves; leaf-blades long-tapering, 2-5 ram. wide; head 2-;-12 cm. long,_ with 

 very many small spikes; pistillate scales strongly awned; perigynia yellowish at 

 maturity, 2-3 mm. long, the beak about the length of the body. Swampy places: 

 N.B.—Fla.— Tex.— Colo.— Ore.— B.C. Plains. Je-Au. 



12. Paxiculatae Kunth. Densely or loosely cespitose. Culms not flat- 

 tened. Opaque part of sheaths strongly red-dotted. Spikes numerous, small, 

 androgynous or pistillate, but never gynaecandrous, the lower compound or 

 decompound. Bracts usually inconspicuous. Perigynia thick, strongly convex on 

 the dorsal, and often somewhat convex on the ventral face, brovynish or chestnut 

 in age, ascending or spreading, coriaceous, spongy at base, stipitate, narrowly 

 margined, more or less nerved, conspicuously rough-beaked, the beak bidentate. 

 Achenes lenticular. Style-base more or less thickened. Stigmas 2. 



23. C. diandra Schrank. Culms slender, sharply triangular, loosely cespi- 

 tose, 3-7 dm. high; leaf-blades 1.25 mm. wide; head 2.5-5 cm. long, somewhat 

 compound; the lower spikes more or less separated; scales acute, brownish, with 

 lighter midvein and hyaUne margins; perigynia somewhat biconvex, dark chest- 

 nut, shining, nerveless on inner face, spreading at maturity. Wet meadows: 

 N.S.— Pa.— Colo.— B.C.— Alaska; Eurasia. Mont.^Bor. My-Jl. 



24. C. prairea Dewey. Culms sharply triangular, 5-10 dm. high; leaf- 

 blades with slightly revolute margins; head 4-8 cm. long, decompound, the lower 

 3-5 branches separated; scales acute or acuminate, light brown, with broad 

 light-colored center and hyaline margins; perigynia 1.25 mm. wide, nerveless, or 

 lightly nerved on inner face, ascending, plano-convex or nearly so, reddish brown, 

 dull, the beak serrulate. Wet meadows: Que.— X.J.— la.— Sask. Boreal. 

 ^ly-Jl. 



25. C. Cusickii Mackenzie. Cuhns sharply triangular, 7-12 dm high; leaf- 

 blades with slightly revolute margins; head 4-8 cm. long, decompound, the lower 

 branches separated; scales chestnut brown, with lighter midvein and hyaline 

 margins; perigjmia 1.5 mm. wide, lightly nerved at base on the inner face, some- 

 what biconvex, spreading in age, bro^vnish black, dull, the beak setulose-serrulate. 

 C. teretiuscula var. ampla Bailey. Wet meadows: B.C.— Mont.— Calif, iiub- 

 mont. My-S. 



13. Stenorhynchae Hohn. Densely cespitose or with more or less elongated 

 rootstocks. Culms triangular or somewhat flattened. Opaque part of sheaths 

 usually transversely rugulose or red-dotted. Spikes few to many androgj-noua 

 to pistillate, but never gynaecandrous, the lower from simple to compound. 

 Bracts little developed. Perig>mia plano-convex, yellowish or yellowish brov\-n, 

 appressed-ascending to spreading, not thick-walled but strongly spongy at base 

 stipitate, strongly many-nerved, the margms nearly obso ete on the lower half, 

 coAspicuously beaked, the beak bidentate. Achenes lenticular. Style-base 

 more or less thickened. Stigmas 2. 



26. C. Jonesii Bailey. Culms 2-4 dm. high, slender, very rough above, 

 densely cespitose from elongated rootstocks; leaves clustered near base, the 

 blades 1-2 mm. wide; opaque part of sheath white, not cross-rugulose, truncate 

 at mouth; spikes in a dense ovoid head 8-12 mm. long; scales bro^^-n ^^th mcon- 

 spicuous midvein, exceeding the perigynia; perig>mia 3.5 mm. long the beak 

 nearly smooth. High mountains: Mont.-Wyo.-Calif .-^\ ash. Submont.^ 



Mont. Jl-Au. 



nervina 



dm 



densely cespitose from short elongated rootstocks, strongly aphyUopodic leaf- 

 blades clustered on the lower fourth of stem, 3.5 mrn^wide; «P^q'^\P^'"J^°f/5pn.e 

 ohve-tinged, becoming cross-rugulose, rounded at the ^f^t^'.^P^^^,"^^ l^f/ 

 ovoid or oblong head, 15-24 mm. long; scales as m the last , pengymia \mm- long- 

 the beak slightly serrulate. High mountains: A^ yo.— Calif .—W ash. Ji Au. 

 28. C. stipata Muhl. Culms 3-10 dm. high, strongly serrulate above, 

 growing in dense clumps; leaf-blades 4-8 mm. wide, the opaque part of sheaths 



