2IO FLORA. 



Plants distinctly glaucous. 



Pistillate spikes drooping on hair-like stalks. 



113. C. laxiculmis. 

 Pistillate spikes erect. 



Basal leaves much longer than the culm. 



114. C. ptychocarpa. 

 Basal leaves shorter than the culm or equalling it. 



Leaves 12-25 mm - wide. 115. C. platyphylla. 



Leaves 2-4 mm. wide. 



Scales acute; perigynia yellow, purple or mottled. 



116. C. panicea. 

 Scales obtuse, or the lower acute ; perigynia pale green. 



117. C, livida. 

 Perigynia white, yellow or becoming brown. Bicolores. 



Perigynia beakless. 118. C. aurea. 



Perigynia with a short cylindric beak ; arctic species. 119. C. bicolor. 



Leaves and culms almost capillary ; bracts reduced to bladeless sheaths. Digitatae. 



120. C. seti/olia. 

 Scales of the spikes leaf-like, elongated. Phyllostachyae. 



Lower scales 2 mm. wide or less, not concealing the perigynia. 



Body of the perigynium oblong; beak flattened. 136. C. Willdenovii. 



Body of the perigynium globose ; beak subulate. 137. C. Jamesii. 



Lower scales 2-4 mm. wide, concealing the perigynia. 138. C. duri/olia. 



100. Carex conoidea Schk. Field Sedge. (I. F. f. 770.) Glabrous; culms 

 rather stiff, 2-5 dm. tall. Leaves 2-3 mm. wide; lower bracts similar; staminate 

 spike long-stalked; pistillate spikes 1-3, distant, erect, oblong, 1-2.5 cm. long, 5 

 mm. thick, the lower slender-stalked; perigynia oblong, obtusely 3-angled, acute, 

 beakless, 2-3 mm. long, about I mm. thick, the orifice entire; scales broadly ovate, 

 contracted into a rough awn, the lower longer than the perigynia, the upper shorter 

 than or equalling them. In meadows, N. S. to Ont., south to R. I.. N. J., Ohio 

 and Iowa. May-June. 



101. Carex oligocarpa Schk. Few-fruited Sedge. (I. F. 771.) Glabrous; 

 culms very slender or almost filiform, roughish, 2-5 dm. long. Leaves about 2 

 mm. wide, soft, the bracts similar; rvtamin: spike long-stalked or nearly sessile; 

 pistillate spikes 2-4, erect or : ",:Ty , s distant, loosely few-flowered, 8-16 mm. 

 long, less than 4 mm. thick, the 1 e • filiform-stalked; perigynia oblong, pale, 2- 

 2.5 mm. long, narrowed into a sh rt cniir^beak; scales ovate, with a rough 'spread- 

 ing awn. In dry woods and thickets ; Vt and Ont. to Mich., Iowa, N. J., W. Va. 

 Mo., and Kans. May-July. 



102. Carex Hitchcockiana Dew^y. Hitchcock's Sedge. (I. F. f. 772.) 

 Culms slender, 3-6 dm. tall ; leaves 3-6 mm. wide, the similar bracts overtopping 

 the spikes, their sheaths pubescent, cheir blades somewhat so; pistillate spikes 2-4, 

 loosely few-flowered, perigynia ovoid, obtusely 3-angled, 3 mm. long, nearly 2 mm. 

 thick, with a short oblique entire beak; : caler ovate or ovate-lanceolate, rough- 

 awned. In woods and thickets, Vt. and Gni. to Mich., Iowa, N. J., W. Va. and 

 Mo. May-July. 



103. Carex altocaulis (Dewey) Britton. Sheathed Sedge. (I. F. f. 773.) 

 Glabrous; culms slender, weak, 2-6 dm. long. Leaves 3-4 mm. wide, shorter 

 than the culm, the upper ones and the bracts usually very short; staminate spike 

 long-stalked; pistillate spikes 2 or 3, distant, slender-stalked, less than 2.5 cm. 

 long, loosely several-flowered, their stalks partly enclosed by the long sheaths; 

 perigynia oblong, 3-angled, few-nerved, 4 mm. long, with a beak about one-fourth 

 the Length of the body, the orifice 2-tooth, oblique; scales oval or ovate-lanceolate. 

 In swamps. Queb.c and Vt. to Ont., N. Y. and Minn. Summer. 



104. Carex ^olymorpha Muhl. Variable Sedge. (I. F. f. 774.) Gla- 

 brous, rather dark green; culms stiff, 2-6 dm. tall. Leaves 3-4 mm. wide, nearly 

 erect; bracts usually little longer than the pistillate spike; staminate spikes 1 or 2, 

 long-stalked; pistillate spikes commonly solitary, erect, short-stalked or sessile, 

 2-4 cm. long, 8 mm. thick; perigynia ovoid-oblong, obscurely 3-angled, fully 

 4 mm. Long and 2 mm. in diameter, the beak more than one-half as long as the 

 body, the orifice oblique; scales red-brown, somewhat shorter than the perigynia. 

 In swamps or wet meadow-. Me. to N. J.. Penn. and N. Car. June-Aug. 



105. Carex tetanica Schk. Wood's Sei><;e. (I. F. f. 775.) Light green 



