CYPEKACEAE (SEDGE FAMILY) 



179 



DJl. C. flavus. 



232. C. Grayii. 



(1.5-6 dm. high), much exceeding the smooth (or scabrous- 

 margined) tlat (2-5 mm. wide) leaves ; umbel with numer- 

 ous ascending rays, the longest half as long as the involucre ; 

 heads globose^ 1-1.5 cm. in diameter; spikelets 20-40, 

 greenish, rather loosely spreading, lance-cylindric, slightly 

 compressed, of 5-8 membranous veiny ovate-lanceolate scales 

 (ilie 2 lowest and the subulate 

 terminal one empty) ; achene ob- 

 long, 1.5-2 mm. long. — llich 

 sandy soil, Va. and Mo., southw. Fig. 230. 



31. C. FLXvrs (Vahl) Boeckl. Culms sharply 

 angled, smooth and wiry (2-5 dm. high), much exceed- 

 ins the smooth, flat leaves; heads 3-6, cylindric (1-1.7 

 cm. long), sessile in a glomerule ; involucral bracts 

 divergent or reflexed ; spikelets crowded, 2.5-5 nnn. 

 long. "dull, pale brown ; scales thin and. veiny, the lowest 

 often persistent. — Waste ground, a,bout Thiladelphia. 

 (Adv. from the Tropics.) Fig. 231. 



32. C. Grayii Torr. Culm thread-form, wiry (0.5-3 

 dm. high) ; leaves almost hristle-shaped, channeled ; 



umbel simple, 4:-li)-rayed ; spiJcelets in a loose head, spread- 

 ing ; joints of the axis icinged; scales rather obtuse, green- 

 ish-chestnut^color, barely excei ding the oblong or narrowly 

 obovoid achene. — Barren sands, 

 ]Mass. to K. J., near the coast. 

 Fig. 232. 



33. C.HoughtoniiTorr. Culms 

 obtusely angled (2-7 dm. high), 

 much exceeding the smooth nar- 

 row leaves ; umbel subsessile or 

 with a few elongate upright rays, 

 mostly shorter than the invo- 

 lucre ; spikelets linear-oblong, in 

 loose heads, spreading-ascending; 

 scales roundish, strongly nerved, mucronate, yellow- 

 brown, barely exceeding the broad-obovoid achene.- — 

 Sandy soil, w. N. E. to Man. and Ore., locally s. to 

 Va., Kan., and Ariz. Fig. 233. 



34. C. filiculmis Vahl. Culm slender, wiry, often 



reclined (1.5-6 dm. high); leaves linear or filiform; spikelets 

 numerous and clustered in one sessile dense head, or in 1-7 

 additional looser heads on spreading rays of an irregulai 

 umbel, those of the principal glomerules 8-12-fiowered (1-1.6 

 cm. long) ; joints of the axis naked or winged ; scales blunt, 

 or the upper mucronate, thin, yellowish-green ; achene 2 mm. 

 long. (C Bushii Britton.) — Dry sterile soil, Mass. to la., 

 and southw. ; rare nortliw. Fig. 234. 



Var. macilentus Fern aid. Usually low ; spikelets 4-8- 

 flowered (3-8 mm. long) ; scales firm, greenish ; achenes 

 235. c.m.,v. macil. shorter. — Me. to Ont., s. to Va., O., and 111. Fig. 235. 



233. C. Houglitoiiii. 



234. C. filiculmis. 



2. KYLLINCA Rottb. 



Spikelets of 3 or 4 two-ranked scales, 1-lJ-fiowered ; the 

 2 lower scales minute and empty ; style 2-cleft and achene 

 lenticular ; spikes densely aggregated in solitary or triple sessile 

 heads. — Culms leafy at base; involucre 3-leaved. (Named 

 after Pcder Kylling, a Danish botanist of the 17th century.) 



1. K. pumila Miclix. Annual; culms 0.5-3 dm. high ; head 

 globular or 3-Iobed, whitish-green, 4-8 mm. broad ; spikelets 



236. K. pumila. 



