CYPERACEAE. 205 



rather loose, 3 mm. in diameter, the terminal one staminate below, the lower one 

 commonly filiform-stalked; perigynia narrowed at each end, 2 mm. long, rather 

 more than 1 mm. thick; scales ovate, shorter than the perigynia. In woods, Me. 

 and Ont. to N. Car. June-Aug. 



75. Carex triceps Michx. Hirsute Sedge. (I. F. f. 745.) Light green; 

 culms rough above, 1.5-9 dm. long. Leaves 2-4 mm. wide, pubescent; spikes 

 2-5, dense, erect, sessile or very nearly so, 6-16 mm. long, usually clustered, the 

 terminal one staminate at the base; perigynia oval or obovoid, flattened, not in- 

 flated, green or greenish-brown, few-nerved, usually pubescent when young, when 

 mature 1-2 mm. long, the orifice minutely notched or entire; scales ovate, cuspi- 

 date or short-awned; achene elliptic-obovoid, its summit not bent. In woods, fields 

 and swamps, Mass. to southern Ont. and Mich., Fla. and Tex. April-Aug. 



76. Carex Caroliniana Schwein. Carolina Sedge. (I. F. f. 746.) Culms 

 slender, rough above, 0.3-0.6 m. tall. Leaves 2-3 mm. wide, rather dark green, 

 glabrous except on the sheaths; spikes 2-4, oblong, dense, sessile or nearly so, 

 8-12 mm. long; clustered; the upper one staminate at the base; perigynia subglo- 

 bose or obovoid, swollen, about 1 mm. in diameter, nerveless or faintly nerved, 

 brown, beakless; scales brown, ovate, mucronate; achene pyriform, bent at the 



, summit or tipped with the bent style. In meadows, N. J. and Penn. to N. Car. 

 and Ark. May-July. 



Perigynia 2-4 mm. long, slightly swollen ; spikes linear or linear-cylindric. 



Plant glabrous ; perigynia obtuse. 77. C. gracillima. 



Sheaths pubescent ; perigynia pointed at both ends. 



Perigynia 2 mm. long ; spikes erect or somewhat spreading. 78. C. aestivalis. 

 Perigynia 4 mm. long ; spikes drooping, at least when old. 79. C. oxylepis. 

 Perigynia 4-5 mm. long, manifestly swollen ; spikes oblong or oblong-cylindric. 



Perigynia faintly few-nerved ; scales ovate, acute or short-awned. 80. C./ormosa. 

 Perigynia strongly many-nerved; scales lanceolate, long-awned. 81. C. Davisii. 



77. Carex gracillima Schwein. Graceful Sedge. (I. F. f. 747.) Glabrous; 

 culms roughish above, 0.3-1 m. long. Leaves dark green, 3-6 mm. wide, shorter 

 than the culm; lower bract foliaceous; spikes 3-5, 2-6 cm. long, about 4 mm. 

 thick or sometimes much smaller, filiform-stalked and drooping, the upper one 

 partly or wholly staminate; perigynia ovoid-oblong, obtuse, few-nerved, glabrous, 

 2 mm. long; scales ovate-oblong, pale, one-half as long as the perigynia. In 

 moist woods and meadows, Newf. to Manitoba, N. Car., Ohio and Mich. May- 

 July. 



Professor Bailey has described a hybrid with C. hirsuta. Carex Sullivantii Boott, is 

 a hybrid of C. gracillima with C. pubescens. 



78. Carex aestivalis M. A. Curtis. Summer Sedge. (I. F. f. 748.) Culms 

 slender or filiform, 0.2-0.5 m. tall. Leaves flat, 2-3 mm. wide, elongated, 

 their sheaths usually pubescent; spikes 3-5, narrowly linear, erect or somewhat 

 spreading, 2-5 cm. long, about 3 mm. thick, the terminal staminate at the base 

 or also at the summit; perigynia oblong, 3 -sided, few-nerved, 2 mm. long, beakless, 

 the orifice entire; scales ovate-oblong, the lower cuspidate or short-awned. In 

 mountain woods, Mass. and N. Y. to Ga. June-Aug. 



79. Carex oxylepis Torr. & Hook. Sharp-scaled Sedge. (I. F. f. 749.) 

 Culms slender, smooth, 0.2-0.5 m. tall. Leaves 3-6 mm. wide, pubescent, espe- 

 cially on the sheaths; spikes 4 or 5, linear-cylindric, 2-5 cm. long, about 4 mm. 

 in diameter, filiform-stalked, the terminal one staminate at the base or sometimes 

 wholly staminate; perigynia oblong, 3 -angled, pointed at both ends, less than 2 

 mm. thick, several-nerved, the orifice entire; scales ovate-lanceolate; short-awned, 

 shorter than the perigynia. Mo. to Tenn., S. Car., Tex. and Fla. April-May. 



80. Carex formosa Dewey. Handsome Sedge. (I. F. f. 750.) Culms slender, 

 smooth, 0.2-0.6 m. tall. Leaves pubescent, especially on the sheaths, the basal 

 4-6 mm. wide; spikes 3-5, dense, 1-3 cm. long, nearly 6 mm. in diameter, filiform- 

 stalked, the upper one staminate at the base; perigynia ovoid, glabrous, swollen, 

 4 mm. long, 2 mm. thick, with a short slightly notched beak; scales lanceolate or 

 ovate, green, acute, or the lower short-awned. In dry woods and thickets, Mass, 

 and Vt. to Ont., N. Y. and Mich. June-July. 



