404 CYPERACE/E. 



White Mountains, N. II. Oakes. Culm. 4 10 inches high, erect. Leaves 

 flat and long. Scirpus-like Sedge. 



*** Spike androgynous. 

 f Stigmas 2. 



4. C. exilis Dew. : fertile spike staminate below, ovoid, rather densely 

 flowered ; perigynium ovate-lanceolate, convex on both sides, finally 

 spreading or recurved, a little longer than the ovate acute scale. 



Lakes and meadows. Mass. N. Y. and N. J. June. 1J-. Culm 12 20 

 inches high, very slender. Leaves setaceous. Spike from half an inch to an 

 inch long. Slender Sedge. 



ft Stigmas 3. 



5. C. pauciflora Light/. : spike simple, about 4-flowered ; staminate 

 flower subsolitary, terminal ; perigynium lanceolate, terete, reflexed ; scales 

 caducous. C. leucoglochin Linn. 



Sphagnous swamps. Mass, and N. Y. May, June. %. Culm 3 8 inches 

 high. Perigynium large, pale yellow, caducous. Few-jloivered Sedge. 



6. C. Fraseri Sims : spike simple, ovoid ; perigynium ovoid-subglobose, 

 entire at the point, striate, longer than the oblong scale. C. lagopus Muhl. 



Mountains. Penn. to N. Car. April. %. Culm about a foot high, sheathed 

 nt base. Leaves radical, broad, undulate. Fraser's Sedge. 



7. C. polytrichoides Muhl. : spike simple, oblong-linear, few-flowered ; 

 perigynium oblong-lanceolate, compressed, triquetrous, obtuse, emarginate, 

 twice as long as the ovate scale. 



Wet grounds. Can. to Penn. ; common. May. %. Culm a foot high, very 

 slender. Leaves subradical, very narrow. Fertile flowers 3 8. 



Brittle-stalked Sedge. 



8. C. Wittdenovii Schk. - spike simple ; sterile and fertile flowers about 

 6 ; perigynium ovoid-oblong, acuminate-rostrate ; scales ovate, acuminate, 

 the inferior ones foliaceous and often longer than the spike. 



Shady woods. N. Y. to Car. W. to Ohio. May, June. %. Culm 812 

 inches high, slender. Leaves flat, longer than the culm. 



Wittdenow's Sedge. 



9. C. Backii Boott : spike simple ; sterile flowers above, about 3, the 

 fertile 2 4 ; fertile scales foliaceous, the lower one much longer than the 

 spike ; perigynium globose-ovoid, acuminated, with a conical smooth beak, 

 entire at the point. ( Torr. N. Y. Fl.} C. Wittdenovii Gray. 



Arct. Airier, to N. Y. Culms cespitose. Leaves grass-like, longer than the 

 culms. Achenium globose-pyriform, nearly smooth. Sack's Sedge. 



B. Spikelets aggregated, androgynous, sessile. Stigmas 2. 



* SpikeUls sterile at the summit. 



10. C. disperma Dew. : spikelets about 3, rather remote, mostly 2-flow- 

 ered, somewhat erect, the lowest one bracteate ; perigynium ovate, rather 

 obtuse, nerved, plano-convex, smooth, with a scabrous margin, entire at the 

 point, twice as long as the ovate obtuse submucronate scale. 



Swamps; often on mountains. N. Eng. and N. Y, W. to Mich. May, 

 June. Ti. Culm 6 12 inches high. Leaves narrow and linear. Spikelets 

 24. Two -seeded Sedge. 



