CYPERACE^E. 431 



B. Inflorescence monoecious. 

 \ All the spikes androgynous. 



* Spike solitary. 

 a. Summit staminiferous. 



2. C.fraseri Sims: spike simple, ovate ; fruit ovate-subglobose, en- 

 tire at the point, longer than the oblong glume ; leaves lanceolate, un- 

 dulate, crenulate; scape sheathed at the base. C. lagopus Muhl. 



HAB. Mountains. Penn. N. Car. April. Zf. Leaves broad, 

 radical. 



3. C. icilldenovii Schk. : spike simple, ovate ; sterile and fertile 

 tiowers about 6 ; fruit ovate, subglobose at the base, rostrate ; glumes 

 ovate, acuminate, the inferior ones very long and foliaceous, much ex- 

 ceeding the culm. 



HAB. Rocky woods. Penn. to N. Car. May, June. 2[. Culm 

 8 12 inches high. Lower glumes foliaceous and much longer 

 than the spike. 



4. C. polyttichoides Muhl : spike simple ; fruit oblong-lanceolate, 

 compressed, triquetrous, obtuse, emarginate ; glumes oblong-obtuse, 

 mucronate. 



HAB. Dry hills and bogs. Can. to Penn. ; common. May. 2J!. 

 Culm a foot high, very slender. Leaves subradical, very narrow. 



5. C. paucijlora Light. : spike about 4-flowered ; sterile flower sub- 

 solitary, terminal ; fruit lanceolate, terete, reflexed ; fertile glumes 

 caducous. 



HAB. Sphagnous swamps. May, June. "H.Culm 8 inches 

 high. Fruit large, pale yellow, caducous. 



b. Summit pistilliferous. 



6. C. squarrosa Linn. .' spike mostly simple, (sometimes spikes 

 2 3,) very thick, oblong-cylindrical ; fruit imbricate, at length hori- 

 zontal, smooth, subsquarrose, bidentate at the point, longer than the 

 lanceolate glume. C. typhina Mich. 



HAB. Bogs. Can. to Geor. W. to Miss. May, June. If. 

 Culm 2 feet high. Spike nearly an inch long and half an inch 

 thick. 



** Spikes several, aggregated into a head. 



7. C. cepJialophora MuJd. : spikes collected into an elliptical head ; 

 fruit ovate, scabrous on the margin above, about equal to the ovate 

 subaristate glume. 



HAB. Oak woods. Can. to Car. ; common. May. If. Culm 

 12 feet high, wiry, leafy at base. Spikes forming a trifid head. 



*** Spikes distinct, (iy)t aggregated into ahead.) 



a. Summit staminiferous. 



1. With 2 stigmas, 



8. C. bromoides Schk. : spikes 46, alternate, oblong, erect, upper- 

 most one sterile above, the rest pistilliferous or androgynous (sterile 



