SEDGE FAMILY 121 



elliptic-lanceolate, 3.5 mm. long, 1.2o mm. wide, finely conspicuously many- 

 nerved, not inflated, nor membranous, stipitate. Alpine ridges: Alta. Alp, Jl. 



7. DiviSAE Christ. Rootstocks long-creeping, dark-colored, tough, the culms 

 arising singly or in small clumps at intervals, mostly stiff, dark-tinged at the 

 base, aphyllopodic. Leaf-blades narrow. Spikes few to many, more or less 

 closely aggregated into an oblong or oblong-ovoid head, androgynous or dioeci- 

 ous, ovoid or oblong. Heads in some species dioecious or nearly so. Lowest 

 one or several of the lower bracts developed, short-prolonged, the others bract- 

 like. Perigynia appressed-ascending, plano-convex, smooth, often shinmg, 

 coriaceous, more or less nerved on outer and nerved or nerveless on inner surface, 

 sharp-edged but not wing-margined, rounded and spongy at base, the obhquely 

 cut beak in age bidentulate. Achenes lenticular, closely enveloped. Stigmas 2, 



10. C. Douglasii Boott, Culms 6^30 cm. high; leaf-blades 1-2.5 mm. wide; 



staminate spikes linear-elKptic, 8-15 mm. long, 2.5-4 mm. wide: pistillate spikes 

 wider; scales ovate to lanceolate, vellowish-brown, with hyaline margins and 

 lighter center, concealing the perigynia; perigjTiia lanceolate, strongly nerved, 

 4 mm. long, 1.75 mm. wide, hght brownish; styles elongate. C. trrasa Bailey. 

 Dry or alkaline soil: Man.— Neb.— N.M.— Cahf.— B.C. Plain^MonL My- 

 Au. 



11. C. stenophylla Wahl. Cuhns 5-20 cm. high; leaf-blades L5 mni. wide 

 at the base, involute above; spikes few, densely aggregated into a head /-lo 

 mm. long; scales broadly ovate, brownish with hyalme margins; perigynia few 

 to a spike, ovate, hghtly nerved on both surfaces, 3 mm. long^^ 1.75 mni wide, 

 blackish at maturity; styles short. (7. Eleocharis Bailey. Dry soil: Man.— 

 Iowa— N.M.— Utah— Yukon; Eurasia. Plains— Mont. Je-Jl. 



simulata 



2-4 



wide, flat; head 12-25 mm. long, 6-10 mm. wide, the spikes densely aggregated, 

 pistillate, staminate, or androgvnous; scales hrovm with hyahne margins, conceal- 

 ing the perigynia; perigynia 2.25 mm. long, 1.4 mm wide round-truncate at 

 base, abruptly beaked, serrulate above. C. Gayana N. Am. auth. \^ et soil, Mont. 



■N.M.— Calif.— Wash. Sub7?iont—MonL My-S 



praegracilis W. Boott. Culms 2-5 dm, high; leaf-blades 1.5-3 

 *^ ** ' ' ne to ovate-oblong, l-o cm. 



long, 6-12 



4-10 nerier 



3-4 



rown 



the inner surface. C. marcida Boott. .C-., «sto Bailey C. aZierna ^^^^^^^^^^^^ 

 Clarke. C. camporum Mackenzie. Meadows widely d^tributed and variable. 

 Man.-Iowa-Kans.^Calif.-B.C; Mex. Prairu-PlainsSubmont. Mj- 



Au 



14. C. SartweUu Dewey. Culms 4-7 dm. high rough ?|bov«; le^^f;^^^^ 



Boreal. My-Au . 



8. CHORDORRHIZ..E Fries. Culms elongate, prostrate branching th^e^oot- 

 stocks and roots httle developed. Leaf-blades narrow Spikes 3-10 andro^ 

 nous, few-flowered, closely aggregated into an ovo.d head- Bracks ab-^^t ^^ 

 inconspicuous. Perigynia very thick Pl^^^^^^^^^^^^?. «^^^?^^;°J^*^^ 

 shining, coriaceous, closely many-nerved, rounded on the '"^^/f^",''- J^ closdv 

 spongj at the ba^e, the short beak obhquely cut. Achenes lenticular, closely 



enveloped. Stigmas 2. ,,,_,. 



15. C. chordorrhiza Ehrh. Cuhns 1.5-3 dm. high; head l-l-J ^-Jo^g: 

 perig>-nia 4-5 mm. long. Sphagnum bogs: Anticosti-Me.-lnd.-&asK. 



Mack.— B.C.; Eurasia. Boreal. My-Jl. 



