MONOECIA TRIANDRIA. 429 



HAB. Borders of lakes, &c. Aug. Sept. r l[; 2 feet high; leav. 



ens if., long. 

 S. americanum : lower leaves equal with, or exceeding the stem, which 



is nearly simple ; floral ones concave at the base and erect ; stigma 



simple, ovate-oblong, oblique, scarcely more than half the length of 



the style. 

 HAB. Lakes. Aug. 1\. ; stem 12 in. high; lower leaves carinate ; 



fertile heads 2 5. 



369. CAREX. Sedge. 



Inflorescence 'monoecious. 



* All the spikes androgynous. 



t Spike solitary. 



a. Summit staminiferous. 



C. polytrichoides : spike simple ; fruit oblong-lanceolate, compressed, 



triquetrous, obtuse, emarginate ; glumes oblong-obtuse, mucronate. 

 HAB. Dry hills and bogs. May, Tj. ; culm afoot high, very slender 

 -leaves narrow-linear. 



b. Summit pistiliferous. 



C. squarrosa : spike mostly simple, (sometimes spikes 2 3,) very thick, 

 oblong-cylindrical ; fruit imbricate, at length horizontal, smooth, sub- 

 squarrose, bidentate at the point, longer than the lanceolate glume. 



HAB. Bogs. June, 7j ; culm 2 feet high ; spike f in. long, | inch 

 thick. 



* * Spikes several, aggregated into a head. 



C. cephalaphora : spikes collected into an elliptical head ; fruit ovate, 

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



f'ume. 

 B. 



HAB. Hills. May, Ij. ; culm 1 2 feet high, cespit., wiry ; heaa 

 subtrifid. 



* * * Spikes distinct, (not aggregated into a head.) 



a. Summit staminiferous. 



1. With 2 stigmas 



C. bromoides: spikes 4 6, alternate, oblong, erect, uppermost onu 

 sterile above, the rest pistiliferous or androgynous (sterile above and 

 below ;) fruit erect, lanceolate acuminate, scabrous, nerved, bifid, 

 longer than the ovate-lanceolate glume. 



HAB. Bogs. May, Tj.; culm 12 18 inches high, slender; spike, 

 subdist., J inch long. 



