252 



CYPERACEAE (SEDGE FAMILY) 



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

 passing to niauy 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. 637. 



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



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



solitary, from creeping rootetock, 



flatfish 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 

 ,- . approximate, narrowly long-cylindri- 



SSi. L>. lur., v. jrrac. * ,~ ,_- rii-i 



cal (2.o-< .o 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. retrtirsa 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 14, sessile or short- 

 peduncled; pistillate spikes 

 3-8, approximate near the 

 top of the culin 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. ROBIXSOXII 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. Macoiinii (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 

 24, mostly scattered, sessile, or the lowest short-ped uncled, 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. 



538. C. Schweinitzii. 



589. C. retrorsa. 



540. C. Halei. 



