252 



CYPERACEAE (SEDGE FAMILY) 



abundant eastw. Fig. 636. — Hybridizes with C. lupulina. Very variable, 

 passing to many scarcely distinguishable forms, and to 



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



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



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



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



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



high, yelloioish-green^ becoming straw-colored in drying ; culm 



solitary., from creeping rootstock, 



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- 



537. C. lur., V. grac. ^^^(^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. 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 hut 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. 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 loide-spreading. — Local, 

 N. H. to Ont. and Mich. 



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

 but perigynia ascenaing. (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. 



538. C. fechweinitzii. 



540. C. Halei. 



