CYPERACEAE (SEDGE FAMILY) 



175 



205. C. Gatesii. 



cated, pale brown ; stamens 2 ; achene linear-oblong 



orclavate (0.3-0. 5 mm. broad), short-pointed, grayish 



and minutely pitted. (C. polystachyus, var. lepto- 



stachyus Boeckl.) Shores, mostly near the coast, 



N. J. to Fla. and Tex. FIG. 204. 



6. C. GatSsii Torr. Similar ; very slender ; leaves 



and very long ascending involucral bracts 1-2.5 mm. 

 broad; spikelets 0.4-1.5 cm. 

 long; the oblong scales green- 

 ish; achenes slightly smaller. 

 Low grounds, Va. to Fla., Ark., 

 and Tex. FIG. 205. 



7. C. flavicpmus Michx. Culm stout, 3-9 dm. high; 

 leaves of the involucre 3-5, very long; spikelets linear, 

 0.7-2 cm. long, spiked and crowded on the whole length 

 of the branches of the several-rayed umbel, spreading ; 

 scales oval, very obtuse, yellowish and brownish, with a 

 broad scarious whitish margin ; stamens 3 ; achene obovate, 

 mucronate, blackish. Low grounds, Va. to Fla. FIG. 



206. C. flavicomus. ^6. 



8. C. aristatus Rottb. Dwarf (2-20 cm. high) ; invo- 

 lucre 2-3-leaved ; spikelets brown, oblong becoming linear, 7-20-flowered, 3-10 

 mm. long, in 1-5 ovoid or subglobose heads (sessile and clustered, 



or short-peduncled) ; scales nerved, tapering to a long recurved 

 point ; stamen 1 ; achene oblong-obovate, obtuse. ( C. inflexus 

 Muhl.) Sandy wet shores, local, N. B. to 

 B. C., and southw. Dry plant with odor 

 of Slippery Elm. FIG. 207. 



9. C. compre'ssus L. Culms 0.5-3. 5 dm. 

 high, with a simple sessile or a few umbel- 

 late clusters of oblong to linear spikelets 

 (15-30-flowered and 0.7-2.5 cm. long), 

 208. C. compressus witn cr owded strongly keeled and very acute 

 greenish many-nerved scales; stamens 3 ; 

 achene obovoid, sharply trigonous. Sterile fields along the coast, Pa. to Fla. 

 and Tex. FIG. 208. 



10. C. Schweinitzii Torr. Perennial, propagating by hard clustered corms ; 

 culm rough on the angles (2-8 dm. high) ; umbel 3-10-rayed, rays very unequal, 

 erect ; spikelets loosely or somewhat re- 

 motely 6-16-Jlowered, with convex many- 

 nerved greenish-brown acute or acumi- 

 nate scales (3.5-4.5 mm. long) ; joints 

 of the rhachilla narrowly winged. Dry 

 sandy shores and ridges, w. N. Y. and 

 e. Ont. to Man. and Kan. FIG. 209. 



11. C. acuminatus Torr. & Hook. 

 Slender (0.5-3.5 dm. high) ; involucre 

 2-3-leaved ; spikelets ovate, becoming 

 oblong, 16-30-flowered, pale, in globular 

 heads ; scales obscurely 8-nerved, short- 

 tipped ; stamen 1 ; achene oblong, pointed 

 at both ends, much exceeded by the 

 scale. Low ground, 111. to Dak., and 

 southw. FIG. 210. 



12. C. pseudovegetus Steud, Tall 

 perennial (0.3-1 m. high); culm obtusely 



triangular ; leaves and involucre very long, keeled ; umbel 

 compound, many-rayed ; spikelets ovate (3-6 mm. long), 

 in numerous small greenish heads; achenes pale, linear, 

 211. c. pseudovegetus. on a slender stipe ; scales narrow, acutish, obscurely 



. 



C. Sclnveinitzii. 



