252 



CYPERACEAE (SEDGE FAMILY) 



abundant eastw. FIG. 536. Hybridizes with C. lupulina. Very variable, 

 passing to many scarcely distinguishable forms, and to 



Var. gracilis (Boott) Bailey. Slender, 3-7 dm. high ; leaves 



2-3 mm. wide; spikes 1-4 cm. long, 1-1.3 cm. thick. (C. 



Baileyi Britton). Cool woods and meadows, Me. to w. N. Y., 



and in the mts. to Tenn., local. FIG. 537. 



168. C. Schweinitzii Dewey. Soft but erect, 2.5-7 dm. 



high, yellowish-green, becoming straw-colored in drying ; culm 



solitary, from creeping rootstock, 



flattish and smooth ; leaves 0.5-1 cm. 



broad, the radical longer than the 



culm, the others mostly short ; spikes 



3-5, the lower one or two short-pe- 



duncled, the others subsessile and 

 KW ', approximate, narrowly long-cylindri- 



537. 0. lur., v. grac. >5 c ' m . long> 8 I 13 n f m . thick), 



538. C. Schweinitzii. 



ascending ; perigynia thin and somewhat inflated, few- 

 nerved, the long beak short-toothed, ascending ; scales 

 awned and commonly rough at the tip, a little shorter 

 than the perigynia. Swamps and wet calcareous soil, 

 s. Vt. to Ont., s. to Ct., n. N. J., and Mich. June, 

 July. FIG. 538. 



169. C. retr6rsa Schwein. Stout, 0.4-1 m. high ; 

 culm obtusely angled and smooth or nearly so ; leaves 



and bracts 0.4-1 cm. broad, 



soft, roughish, much longer 



than the culm ; staminate 



spikes 1-4, sessile or short- 



peduncled ; pistillate spikes 



3-8, approximate near the 



top of the culm or the lowest 



remote, all but the lowest 



1 or 2 sessile or subsessile, 1.5-5 cm. long, 1.7-2 cm. 



thick, compactly flowered, erect or spreading ; peri- 



gynia very thin and papery, much inflated, promi- 



nently nerved, strongly reflexed, conic-ovoid, long- 



beaked, 8-10 mm. long, much exceeding the acuminate 



scales. Wet places, e. Que. to the Saskatchewan 



and B. C., s. to Pa., the Great Lakes, la., Ida., and 



Ore. July-Oct. FIG. 539. 



Hybridizes with C. rostrata. 



Var. EoBiNs6Nii Fernald. 



Spikes slender, 1.2-1.5 cm. 



thick. Local, Me. to Ida. 

 Var. Hartii (Dewey) Gray. 



The remote, often long-pedun- 



cled spikes usually more slen- 



der, 2-8 cm. long; perigynia wide-spreading. Local, 

 N. H. to Ont. and Mich. 



Var. Macounii (Dewey) Fernald. Similar to the last, 

 but perigynia ascending. (C. lupulina x retrorsa Dud- 

 ley.) N. Y., Ont., and Mich. 



170. C. Halei Carey. Culms solitary, slender, smooth, 

 2-6 dm. high ; leaves and bracts soft, roughish, 3-6 mm. 



broad, over-topping the inflorescence ; staminate spike long-peduncled ; pistillate 

 2-4, mostly scattered, sessile, or the lowest short-peduncled, short-cylindric to sub- 

 globose, 2-3.5 cm. long, 2-2.5 cm. thick ; the rather few perigynia conic-ovoid, 

 thin, bladdery, 10-12 mm. long, with a rather abrupt slender-conic beak, twice as 

 long as the firm ovate acuminate scales. (C. louisianica Bailey.) Swamps, 

 Fla. to Tex., north w. in the lowlands to Mo. June-Aug. FIG. 540. 



C. retrorsa. 



540. C. Halei. 



