I9 2 FLORA. 



similar to the upper leaves, usually much overtopping the culm; staminate spike 

 mostly long-stalked; pistillate spikes I or 2, dense, about 2.5 cm. in diameter; 

 perigynia 10-30, ovoid, glabrous or pubescent, much inflated, many-nerved, about 

 8 mm. in diameter, tapering to a sharp 2-toothed beak; scales ovate or lanceolate, 

 acuminate or cuspidate, scarious, about one-third as long as the perigynia; stig- 

 mas 3. In swamps and wet meadows, Vt. to Mich., Ga. and Mo. June-Sept. 



7. Carex Louisianica Bailey. Louisiana Sedge. (I. F. f. 677.) Culms 

 slender, smooth or nearly so, 0.2-0.5 m. tall. Leaves 2-4 mm. wide, roughish, 

 the upper overtopping the spikes; pistillate spikes 1-3, oblong, about 2.5 cm. long, 

 1.5-2 cm. thick, erect, the lower slender-stalked, the upper nearly sessile; stami- 

 nate spike long-stalked; perigynia ovoid, much inflated, smooth, strongly several- 

 nerved, shining, 10-12 mm. long, about 5 mm. in diameter at the rounded base, 

 tapering into the long 2-toothed beak, the small teeth slightly spreading; scales 

 oblong-lanceolate, acuminate, about one-half as long as the perigynia; stigmas 3. 

 Swamps, Mo. to Tex. and Fla. June-Aug. 



8. Carex lupulina Muhl. Hop Sedge. (I. F. f. 678.) Glabrous; culms stout, 

 0.3-1 m. tall. Leaves elongated, nodulose, 5-12 mm. wide, the upper ones and 

 the similar bracts much overtopping the culm; staminate spike solitary or rarely 

 several; pistillate spikes 2-5, densely many-flowered, oblong, 2.5 cm. long, often 

 3-6 cm. in diameter; perigynia often short-stalked, much inflated, many-nerved, 

 12-15 mm - l° n g» about 3 mm. in diameter above the base, tapering from below the 

 middle into a subulate 2-toothed beak; achene longer than thick; scales acuminate 

 or aristate, one-third as long as the perigynia; stigmas 3. In swamps and ditches, 

 Hudson Bay to W. Ont, Iowa, Fla. and Tex. June-Aug. 



Carex lupulina B^lla-villa (Dewey) Bailey. Culm slender; pistillate spikes remote, 

 slender-stalked, sometimes staminate at the summit, the perigynia widely spreading, the 

 staminate spike sometimes branched and with 1 or 2 perigynia at its base. E. N. Y. to 

 S. Ont. 



A hybrid with C. retrorsa is described. 



9. Carex lupuliformis Sartwell. Hop-like Sedge. (I. F. f. 679.) Glabrous; 

 culm stout, erect, 0.3-1 m. tall. Leaves and bracts similar to those of the preced- 

 ing species; staminate spike stalked or nearly sessile, sometimes 10 cm. long; 

 pistillate spikes 3-6, densely many-flowered, 5-8 cm. long, 1-2 cm. in diameter, 

 often staminate at the top; perigynia yellowish, sessile, much inflated, several- 

 nerved, 1 -1. 6 cm. long, about 4 mm. in diameter above the base, tapering from 

 below the middle to a subulate 2-toothed beak; achene as long as thick, its angles 

 mamillate; scales lanceolate, awned, shorter than or equalling the perigynia. 

 Swamps. Mass. to Del., Ont. and Minn. June-Aug. 



i'. Carex grandis Bailey. Large Sedge. (I. F. f. 680.) Glabrous; culms 

 slender. 0.5-0.9 m. high. Leaves rather dark green, elongated, 8-12 mm. wide; 

 bract- similar to the leaves, much overtopping the culm; staminate spike some- 

 times bearing perigynia at its base; pistillate spikes 3-5, all stalked or the upper 

 sessile, cylindric, 2-7.5 cm - l° n g» perigynia much swollen at the base, about 4 mm. 

 in diameter, 10-12 mm. long, many-nerved, spreading at maturity, 3-4 times as 

 long as the scarious lanceolate acuminate or aristate scale, abruptly contracted into 

 a subulate 2-toothed beak 2-3 times as long as the inflated portion; stigmas 3. In 

 swamps, Del. to Ky. and Mo., Fla., La. and Tex. June-Aug. 



Spikes small, 2.5 cm. long or less, oblong or subglobose ; stigmas often 2. 

 Spikes green or greenish yellow. 



Leaves involute ; perigynia ovoid; pistillate spikes few-several-flowered. 



11. C. oligosperma. 

 Leaves flat; perigynia oblong-elliptic; pistillate spikes many-flowered. 



12. C. Mainensts. 

 Spikes dark brown or purple; arctic species. 



Leaves flat. 



Perigynia little inflated, papery. 



Beak of perigynium nearly or quite entire. 13. C. miliaris. 



Beak of perigynium sharply and minutely 2-toothed. 



14. C. saxatilis. 

 Perigynia much inflated, very fragile. 15. C. vtcmbranopacta. 



Leaves involute when dry. 16. C. ambusta. 



