120 CYPERACEAE 



date; perigynia ovate, 4.5-5 mm. long, tapering at apex; achenes 1.25 mm. long, 

 isolated stations on mountain summits: Colo.; Wyo.; Wash. Alp.—Subalp. 



3. Athrochlaenae Holm. Cespitose or with creeping rootstocks. Leaf- 

 blades narrow. Spike solitary, androgynous, bractless, narrow, densely many- 

 ttowered. Pistillate scales soon falUng. Perigynia slenderly strongly stipitate, 

 widely spreading or the lower reflexed, obscurely triangular, nerveless, membran- 

 aceous, long-beaked, the beak obhquely cut, becoming bidentulate. Achenes 

 usually triangular. Stigmas 3, or occasionally 2. 



o^; C- Py^enaica Wahl. Culms 3-20 cm. high, wiry, slender, smooth; leaves 

 2-d to a tertile culm; spike 5-20 mm. long, 3-5 mm. wide; scales chestnut tinged; 

 perigynia 3-4 mm. long. Alpine locaUties: Mack.— Colo.— Ore.— Alaska; 

 Eurasia. Alp.—Svhalp. Jl-S. 



1 *• ^' r^i^^^^f^:^- ^- Meyer. Cuhns 5-20 cm. high, stiflf, firm, smooth; 

 leaves 4-9 to a fertile culm; spike 8-15 mm. long, 6-9 mm. wide; scales dark 

 brovvn tinged; pengj-nia 4 mm. long. Alpine localities: Alta.— Colo.— Calif.— 

 Alaska. Alp.— Mont. Jl-S, 



Ki i' ^f.^iTATAE Christ. Cespitose, the rootstocks somewhat elongate. Leaf- 

 maaes tiiiform. bpike sohtary, ovoid, androgjTious, densely flowered, bractless. 

 Perigynia plano-convex, sharp-edged, not inflated, the walls thinnish, essentiaUy 

 nerveless, sessile, the smooth beak conspicuously hyahne-tipped, in age bidentu- 

 late. Achenes lenticular. Stigmas 2. n > b 



5. C. capitata L. Culms 1-2 dm. high; leaf-blades about 0.5 mm. wide; 

 spike with b-25 ascending pengj-nia; scales ovate-orbicular, obtuse; perigjTiia 

 2-Z.b mm. long and about as broad, abruptly beaked. An arctic species also 

 ^curring very locally on mountam summits southward: Greenl.— Alaska; also 

 N.H., Alta.; Cahf.; Nev.; Mex.; Eu. Alp. Je-Au. 



5. DioicAE Tuckerra. Rootstocks elongate. Cuhns slender. Leaf-blades 



filiform. 

 Perigyn 



androgyn 



rounded 



beaked, the apex hyaline, in ale bTdeTtl^iS^ate^^A^Ws^XK^^^^^^^^^ 



l,nr?;nn^;iF^^r'"f?^ Wormskj. Cuhns 1-3 cm. high, smooth; rootstocks 

 K^^L^ '• P"^-^ ^^^ °'°'- ^«^g' 2-5 mm. wide; scales sharp-pointed, reddish 

 hp^t >^ Jf^"^^""'^ ^^"^iu^ [""5- ^^^S' biconvex, nerved, narrowed into a rough 

 ^X A^ ^ ^^'c^u^- ^^^ !*P*^y- Sphagnum swamps: Greenl.-N.Y.-Mich.- 

 Colo.— Alaska; Siberia. Alp.— Mont. Southward local. My-Au. 



sln^W nr«T^+'^"^!^'''™-T ^?"?tstocks elongate, dark-colored, the culms arising 

 nom ^IriT a''^^1^^''-a I^^^f-blades narrow. Spikes few to several, androgy- 

 XnA-^^vPv !^ '"k * "^^"'^ subglobose or ovoid head. Perigynia spreading, 

 the Xnl ;n,?T^^f f^^^K' '^"^^>. «bsoletely nerved, loosely enveloping 



SjentlTe. TlitnlstntuLT' ^^'2^' ^^^^ «^^'^-^^ -*' ^* ^""^^ 



vemacula 



Culms 1-2 dm. high, smooth; leaf-blades 5-12 



5-4 



perigynia 



w '^"^>\^ iiiui vviue, scarcely inflated, i 

 Wyo.-<:olo.— Calif.— Wash. Alp. Jl-Au. 



2-8 cm ■ W S«f J^^'^:f''''^- ^V^""'^ ^-1-^ ^^™- hiKh, smooth; leaf-blades 

 ovoid?lih?S^4 r^^ r'^ oT^' ^^''^«'^' ^'^^^t 1 c°»- in diameter; perigynia 

 E^tflated ' rT;..?''^f-\^/'f '"™- '^i'^*^' 'n^mbranous, not stipitate, more or 

 IlZp Au S. ^^ '''''• '^'"'^''''^ Kukenth. Alpine ridges: Colo. 



aneL^ W bS2°?^' Mackenzie. Cuhns 2-5 cm. high, smooth, obtusely 

 t:^^kn:lii^; l±Z i^U^rl ^t^'^^^ 7-9 --■ - diameter; 



