252 



CYtEBACEAE (SEDGE FAMILY} 



abundant eastw. Fig. 536. — Hybridizes with C. lupulina. Very tafiabifi, 

 passing to many scarcely distinguishable forms, and to 



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

 2-0 mm. wide; spikes 1-4 cm. long, 1-1.3 cm. thick. (C 

 Baileyi Brltton). — 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, yelloiiiish-green, becoming straw-colored in di^ ing ; culm 

 solitary, from creeping rootstock, 

 fiattish 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, th^others subsessile and 

 ■a? r inr ,„: approximate, narrowly long-cylindri- 

 ' '• ° cal (2.5-7.5 cm. long, 8-13 mm. thick), 

 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. retr(5rsa 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 fiowered, 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 acximinate 

 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 G. rostrata. 

 Var. Robins6nii 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-dreading. — Local, 

 N. H. to Ont. and Mich. 



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

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

 ley.) — N. Y., Ont., and Mich. 



170. C. HJllei 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, 2-2.6 cm. thick ; the rather few perigynia conic-ovoid, 

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

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

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



538. C. Schweinitzii. 



C. retrorsa. 



MO. C. Halel. 



