The Flora of the Cayuga Lake Basin 109 



PAGE 



Achenes 3-angled ; stigmas 3. 



d. Perigynia with orifice entire or emarginate, the teeth if present soft. 

 (2d d, p. 113.) 

 e. Lowest bract evaginate or very nearly so ; orifice of the perigynium 

 straight or nearly so. (2d e, p. 110.) 

 /. Perigynia not contracted into a pedicel-like base, beakless but in 

 some cases very acute, if beaked the whole perigynium very 

 scabrous. 

 g. Foliage glabrous but often scabrous. 



h. Spikes oblong to subglobose, 2 cm. long or less ; scales brown 

 or dark brown ; perigynia merely apiculate, dull glaucous- 

 green, cellular-papillose. 

 i. Spikes sessile, the terminal one usually partly pistillate; scales 



dark, longer than the perigynia 49. C. polygama 123 



i. Spikes peduncled, drooping, the terminal one wholly staminate. 

 /. Scales long-attenuate, much longer than the perigynia, nar- 

 row, exposing the perigynia; culms cespitose. 



50. C. paupercula 123 

 /. Scales merely acute, as long as or longer than the peri- 

 gynia, broad, concealing the perigynia; culms scattered; 

 plant strongly stoloniferous ; leaves generally narrower. 



51. C. limosa 123 

 h. Spikes linear, 2.5-5 cm. long; scales pale; perigynia acute or 

 beaked, pale or bright green. 

 i. Perigynia acute, scarcely beaked, smooth or only cellular- 

 papillose ; leaves 2-5 mm. wide, slightly rough ; spikes " 



spreading or drooping 52. C. prasina 123 



i. Perigynia conspicuously beaked, very scabrous ; leaves 6-12 



mm. wide, very rough; spikes erect 57. C. scabrata 124 



g. Foliage, at least the lower sheaths, distinctly pubescent; peri- 

 gynia bright green, not cellular-papillose. 

 h. Perigynia elliptic-oblong, plump, very obtuse, lustrous, many- 

 nerved but not costate; terminal spike wholly staminate. 



53. C. pallcscens 123 

 h. Perigynia elliptic-oval or ovoid-oval, slightly flattened at least 

 on the inner face, costate, obtuse or often subacute or even 

 slightly beaked ; terminal spike pistillate at summit. 

 i, Perigynia glabrous ; spikes 4-5.5 mm. thick. 



54. C. triceps, var. hirsiita 124 

 i. Perigynia pubescent, slightly smaller ; spikes 3 mm. thick. 

 ;'. Spikes linear, attenuate at base, subacute, the lowest ones 

 (12) 15^t0 mm. long; perigynia elliptic-oval, costate; 

 anthers 1.5-2.5 mm. long; most of the leaves shorter than 



the culm 55. C. virescens 124 



./'. Spikes oblong or oblong-linear, abrupt or rounded at base, 

 obtuse, the lowest ones 5-18 mm. long ; perigynia broadly 

 oval; anthers (0.7) 0.9-1.6 mm. long; most of the leaves 



equaling or exceeding the culm 56. C. Stvanii 124 



/. Perigynia contracted, stipe-like, and often spongy at base, or if not 

 contracted then conspicuously beaked and smooth. 

 g. Foliage pubescent ; leaves 3.5-8 mm. wide ; perigynia pubescent. 



58. C. pub esc ens 124 

 g. Foliage not hairy. 



h. Pistillate spikes not drooping; perigynia pubescent (except in 

 some forms of no. 62), 2-4 mm. long; beak rarely exceeding 

 the body in length; plant low. 



