206 FLORA. 



8l. Carex Davisii Schwein. & Torr. Davts' Sedge. (I. F. f. 751.) Similar 

 to the preceding, stouter. Leaves 3-6 mm. wide, pubescent; lower bract foli- 

 aceous; spikes clustered, or the lower one distant, 6 mm. in diameter, at length 

 spreading or drooping, the terminal one staminate at the base; perigynia much 

 swollen, strongly several-nerved, 4-5 mm. long, with a short but conspicuously 

 2-toothed lx'ak; scales lanceolate or oval, long-awned, equalling or longer than the 

 perigynia. In moist thickets and meadows, Mass. to N. V., Minn., Ga., Ky., 

 Kans. and the Ind. Terr. May-July. 



Perigynia manifestly beaked, nerved or nerveless ; pistillate spikes drooping, at least 

 when old. 



Beak of the perigynium cylindric or subulate, 1-2 times as long as the body. Syl* 

 vaticae. 



Perigynia broadly oval, smooth, spreading. 82. C. longirostris. 



Perigynia narrowly conic, tuberculate-hispid, appressed. 83. C. Assiniboinensis, 

 Beak of the perigynium not more than one-half as long as the body. 



Leaves pubescent. Flexiles. 84. C. castanea. 



Leaves glabrous. 



Pistillate spikes narrowly oblong, 4-12 mm. long ; perigynium 2 mm. 



long ; arctic and alpine species. Capillares. 85. C. capillaris. 

 Pistillate spikes linear, 2-8 cm. long ; perigynium 4-6 mm. long. Debiles. 

 Perigynia membranous, few-nerved ; pistillate spikes slender. 



Leaves 5-10 mm. wide ; scales two-thirds as long as the perigynia. 



86. C. arctata. 

 Leaves 2-5 mm. wide ; scales one-half as long as the perigynia. 



87. C. tenuis. 

 Perigynia coriaceous, strongly many-nerved ; pistillate spikes thicker. 



88. C. oblita. 

 Perigynia beakless or minutely beaked, finely many-striate ; spikes erect or nearly so. 



Griseae. 



Leaves slightly glaucous or not at all. 



Perigynia little longer or shorter than the scales. 



Pistillate spikes dense, usually many-flowered ; leaves 4-6 mm. wide, 



spreading, soft. 89. C. grt'sea. 

 Pistillate spikes loosely several-flowered ; leaves 2-4 mm. wide, mostly erect 



and rigid. 90. C. amphibola. 



Perigynia 2-3 times longer than the scales. 91. C flaccosperma. 



Plant very glaucous all over. 92. C. glaucodea. 



82. Carex longirostris Torr. Long-beaked Sedge. (I. F. f. 752.) Gla- 

 brous, light green; culms slender, roughish above, 0.2-1 m. long. Leaves flat, 

 2-3 mm. wide, usually not exceeding the culm, the bracts similar; staminate spikes 

 1-3, slender-stalked; pistillate spikes 2-4, oblong-cylindric, loosely flowered, 1-5 

 cm. long, 6-8 mm. in diameter, all filiform-stalked and nodding or the upper one 

 nearly sessile; perigynia slightly inflated, pale, strongly 1 -nerved on each side, 

 the body about 2 mm. long, contracted into a very slender beak; scales lanceolate, 

 spreading, acuminate, scarious-margined, 6-8 mm. long. On banks and in moist 

 thickets, N. B. to Ont. and the N. W. Terr., Mass., Penn., Mich, and Neb. June- 

 Sept. 



83. Carex Assiniboinensis W. Boott. Assiniboia Sedge. (I. F. f. 753.) 

 Glabrous; culms filiform, reclining, 0.5-0.6 m. long, longer than the leaves. 

 Leaves and bracts 2 mm. wide or less, the lower reduced to short purplish sheaths; 

 staminate spike long-stalked; pistillate spikes 2 or 3, distant, loosely few-flowered, 

 I.5-3 cm. long, drooping on filiform stalks; the flowers alternate; perigynia ob- 

 tusely 3 -angled, subulate-beaked, above 6 mm. long and 2 mm. thick above the 

 base; scales lanceolate, awned, about the length of the perigynia. In wet soil, 

 northern Minn, and Manitoba. Summer. 



84. Carex castanea Wahl. Chestnut Sedge. (I. F. f. 754.) Culms 

 slender or filiform, rough above, 0.3-I m. tall. Leaves 3-5 mm. wide, shorter than 

 the culm; bracts linear-filiform, 1-3 cm. long; staminate spike stalked; pistillate 

 spikes 1 4. oblong or oblong-cylindric, 1-2.5 cm. long, about 6 mm. thick, droop- 

 ing on filiform stalks; perigynia glabrous, oblong or oblong-lanceolate, 3-angled, 

 few nerved, tapering into a 2-toothed beak one-half as long as the body, scales 

 ovate or ovate-lanceolate, acute or cuspidate, rather shorter than the perigvnia. In 

 dry thickets and on banks, Newf. to Conn.. Minn and Kans. June-July. 



