228 



CYPERACEAE (SEDGE FAMILY) 



407. C. set., 

 v. arubigua. 



408. C. decomposite. 



409. C. diandra. 



maturity ; scales short-owned. Vt. to Ont. and Ky. ; June-Aug 

 FIG. 40(5. 



Var. ambigua (Barratt) Fernald. Perigynia broad-ovate to 

 orbicular, abruptly short-beaked, often golden-brown. ('C. vul- 

 pinoidea, var. ambigua Barratt ; C. xanthocarpa 

 Bicknell.) Dry soil, s. Me. to la., and south w. 

 FIG. 407. 



53. C. decomp6sita Muhl. Stout, exceed- 

 ingly deep green, 0.5-1 m. high, in stools ; culm 

 very obtusely angled, almost terete below ; leaves 

 firm, channeled below, 5-8 mm. wide, longer 

 than the culm; panicle 1-1.5 dm. long, the 

 lower branches ascending and 1.5-3.5 cm. long ; 

 perigynium very small, few-nerved, hard and 

 at maturity shining, the abrupt short beak entire 

 or very nearly so ; scale acute, about the length of the peri- 

 gynium. Swamps, N. Y. to Mich., and southw. ; local. 

 July, Aug. FIG. 408. 



54. C. diandra Schrank. Slender but 

 mostly erect, 3-8 dm. high, in loose stools ; 

 culm rather obtuse, rough at the top, mostly 

 longer than the narrow (1-3 mm. broad) 

 plicate leaves; head 1.5-5 cm. long, 0.5-1 

 cm. thick ; perigynium very small, truncate 

 below, bearing a few inconspicuous short nerves on the outer 

 side, stipitate, firm and at maturity blackish and shining, the 

 short beak lighter colored ; scale the length of 

 the perigynium. (C. teretiuscula Good.) 

 Bogs and wet meadows, e. Que. to the Yukon, 

 s. to Ct., Pa., Mich., Neb., etc. May-July. (Eu.) FIG. 409. 



Var. rambsa (Boott) Fernald. Tall (0.5-1.2 m.) ; head 3-8 cm. 

 long, the upper portion often nodding, the usually pale spikes 

 scattered and the lowest often slightly compound ; 

 perigynia broion. (C. teretiuscula, var. prairea 

 Britton.) Bogs, e. Que. to B. C., s. to Ct., Pa., 

 O., 111., Minn., and Utah. FIG. 410. 



55. C. conjuncta Boott. Strict but rather 

 weak, 0.5-1 m. high ; culm soft and sharply 

 triangular or nearly wing-angled, becoming 

 ribbon-like when pressed ; leaves soft. 5-10 mm. 

 broad ; head 3.5-7.5 cm. long, interrupted, pale 

 green, infrequently bearing a few setaceous 

 bracts ; perigynium lance-ovate, light-colored, 



thickened below, the beak lightly notched and roughish, almost 

 equaling or a little exceeding the cuspidate scale. 

 Swales and glades, Pa. to Ky., 111., la., and 

 Minn. ; local. June. FIG. 411. 



56. C. stipata Muhl. Stout, 0.2-1 m. high, 

 in clumps ; culm rather soft, very sharp ; leaves flat and soft, 

 4-15 mm. wide ; head 2-10 cm. long, often somewhat compound 

 at base, interrupted, the lowest spikes 0.7-2 cm. long; peri- 

 gynium lanceolate, brown-nerved, the beak toothed and rough- 

 ish, about twice the length of the body, and much longer than 

 the scale. Swales, common and variable. May-Aug. FIG. 

 412. 



57. C crus-c6rvi Shuttlw. Stout, glaucous, 0.5-1 m. high ; 

 culm rough, at least above ; leaves flat and very wide ((>-12 mm.); 

 head much branched and compound, 6.5-23 cm. long ; perigynium 

 long-lanceolate, the short base very thick and disk-like, the roughish and 

 very slender beak thrice the length of the body or more, 3-4 times the length 





whitish and 



411. C. conjuncta. 



412. C. sttjiata. 



