476 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Man. ed. 5, 581. C. straminea, var. brevior, 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. — Culms slender, stiff, 

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

 or equalling the culms, usually 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, fig. 869 ; Howe, 1. c. 

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

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

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

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

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

 Prince Edward Island to New t Jersey. June-Aug. 



*o- 



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

 upright spike (C. tenera, var. Bicl/ii, with moniliform flexuous spikes might be 

 looked for here). 



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

 subchartaceous auricle : perigynia appressed-ascending : achenes mostly 

 oblong. 



15. C. alata, 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. C. 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. 



