CYPBBACEAE (SBDGE FAMILY) 



179 



;il. C. flavus. 



C. Grayii. 



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

 margined) flat (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 

 (the 2 lowest and the subulate 

 terminal one empty) ; achene ob- 

 long, 1.5-2 mm. long. — Rich 

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



;!1. C. flXvus (Vahl) Boeckl. Culms sharply 

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

 ing the smooth flat leaves ; heads 3-t), cylindrio (1-1.7 

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

 divei'gent or reflexed; spikelets crowded, 2.5-5 ujm. 

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

 often persistent. — Waste ground, about Philadelphia. 

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



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

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



umbel simple, i-U-rayed ; spikelets in a loose head, spread- 

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

 ish-chestnuVcolor, barely exceeding the oblong or narrowly 

 obovoid achene. — Barren sands, 

 Mass. to N. J., near the coast. 

 Fig. 232. 



33. C.HoughtbniiTorr. 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-asceiiding ; 

 scales roundish, strongly nerved, mucronate, yellow- 

 brown, barely exceeding the broad-obovoid achene. — 

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

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



34. C. filiciilmis 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 

 addition,al looser heads on spreading rays of an irregulai 

 umbel, those of the principal glomerules 8-12-flowered (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 northw. Fig. 234. 



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

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

 15. c. fll., V. macU. shorter. — Me. to Ont., s. to Va., 0., and 111. Fig. 236. 



. 0. Houglitonli. 



234. C. filiculmis. 



3. KYLLfNGA Rottb. 



Spikelets of 3 or 4 two-ranked scales, l-li-flowered;.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 

 alter Peder Kylling, a Danish botanist of the 17th century.) 



1. K. piimila Michx. Annual ; culms 0.5-3 dm. high ; head 

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



K. piuuUa. 



