476 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Man. ed. 5, 581. G. straminea, var. hrevior, Bailey, Mem. Torr. CI. i. 

 22, in part, not Dewey. — Dry or rocky soil, eastern Massachusetts 

 to Manitoba, New Jersey, Ohio, and Arkansas. May-July. 



b. Perigj'nia at most 5.5 mm. long. 



1. Spikelets whitish or silvery-brown, mostly scattered in a flexuous 



moniliform spike. 



14, C. siLiCEA, Olney. — Figs. 41, 42. — Oalms slender, stiff", 

 smooth except at summit, 3 to 8 dm. high : leaves erectish, shorter than 

 or equalling the culms, usualli/ glaucous, 2 to 4.5 mm. wide, often be- 

 coming involute : spike of 3 to 12 usually remote conic-ovoid usually 

 clavate spikelets 1 to 1.5 cm. long: perigynia strongly oppressed, firm 

 and opaque, 4 to 5 mm. long, 2.2 to 3 mm. broad, short-beaked, broad- 

 winged, the body distinctly 3- to 5-nerved on the inner, 6- to 12-nerved on 

 the outer face. — Proc. Am. Acad. vii. 393 ; Bailey, Mem. Torr. CI. i. 

 24, & in Gray, Man. ed. 6, 621 ; Britton, 1. c. 358, i]g. 869 ; Howe, 1. c. 

 44. G. straminea, var. moniliformis. Tuck. 1. c. 9, 17 ; Bailey, Proc. 

 Am. Acad. xxii. 151 ; Macoun, 1. c. 133. G. adusta, Carey in Gray, 

 Man. ed. 2, 516, not Boott. G. foenea, var. y, Boott, 1. c. 118, t. 377. 

 G. foenea, var. (?) subulonum, Gray, Man. ed. 5, 580. G. straminea, 

 var. silicea, Bailey, Carex Cat. 4. — Sand and rocks near the sea, 

 Prince Edward Island to New Jersey. June-Aus. 



*o- 



2. Spikelets green or brownish, approximate or only slightly remote in a mostly 

 upright spike ( C. tenera, var. Richii, with moniliform flexuous spikes might be 

 looked for here). 



O Sheath of tlie leaf green and strongly nerved nearly or quite to the narrow 

 subchartaceous auricle : perigynia appressed-ascending : achenes mostly 

 oblong. 



15. C. ALATAj Torr. — Figs. 43, 44. — Culms rather stout, smooth 

 except at summit, 0.5 to 1 m. high : leaves mostly short and harsh, 2.5 to 

 4.5 mm. wide: spike oblong or ovoid, of 3 to 8 compact green or finally 

 dull-brown conic-ovoid to oblong spikelets 8 to 15 mm. long : perigynia 

 firm and opaque, orbicular or obovate, 4.3 to 5.5 mm. long, 2.8 to 3.7 mm. 

 broad, broad-winged, very faintly nerved 'or nerveless, much broader than 

 the lance-subulate usually rough-awned scales. — Ann. Lye. N. Y. iii. 396 ; 

 Boott, 1. c. 118, t. 378 ; Gray, Man. ed. 5, 581 ; Britton, 1. c. 359, fig. 

 872 ; Howe, 1. c. 45. G. straminea, var. alata, Bailey, Carex Cat. 4, 

 Proc. Am. Acad. xxii. 150 & in Gray, Man. ed. 6, 622. — Marshes 

 and wet woods. New Hampshire to Michigan and Florida, mostly 

 near the coast. June, July. 



