228 



CYPERACEAE (SEDGE FAMILY) 



408. C. decomposite. 



409. C; diandra. 



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

 FIG. 406. 



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

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

 pinoidea, var. ambigua Barratt ; C. xan.thocarpa 

 Bicknell.) Dry soil, s. Me. to la., and southw. 

 FIG. 407. 



53. C. decomp6sita Muhl. Stout, exceed- 

 ingly deep green, 0.5-1 in. 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. didndra 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. ramftsa (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 brown. {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 (6-12 mm.) ; 412 c stipata> 

 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 



410. C. diandra, 

 v. ramosa. 



whitish and 



411. C. conjuncta. 



