CYPERACEJE. 415 



ji. radiata (Dew.) ; sjnkelets distant, about 3-flowered, v/ith setaceous bracts ; 

 peri.g. oblong, acute ; slevi 4 — 8 inches high, flaccid or lax, setaceous, with 

 very narrow leaves. Common in pastures and moist woods; the variety ia 

 about woods, or open places in woods. 



18. C. RETROFLEXA. Muhl. 



Spikdcls about 4, ovate, alternate, subapproximate, sessile, bracteate and 

 stellate in maturity ; perig. ovate, acutish, '2-toothed, subscabrous or smooth 

 on the margin, reflexed and spreading, about equal to the ovate and acute 

 glume ; stem about a foot high. Readily distinguished from the preceding. 

 Woods and pastures, not abundant. 



19. C. STIPATA. JWmA. 



Spike often decompound ; spikehts oblong, aggregated, numerous, bracteate ; 

 perig. ovate-lanceolate, round at the base, plano-convex, nerved, bifid, sub- 

 scabrous on the margin, diverging, twice longer than the ovate-lanceolate 

 glume ; slcm thick, acutely triquetrous, concave ou the sides. Wet places 

 and marshes, abundant. 



20. C. ALOPECoiDA. Turkerman. C. cephalophora, /3. maxima. Dew. 

 Spikr. compound rather loose ; spikehts 8 — 10, aggregated into an oblong 



head, bracteate, sessile ; perig. ovate, plano-convex, scarcely nerved, acumi- 

 nate, serrulate on the edge, bifid, subrostrate, a little longer than the ovate 

 and acuminate glume; stem triquetrous, scabrous on the edges. Moist 

 wroods, Penn. and N. York. Sarlwcli. 



21. C. CEPHALOIDEA. Dew. 



Spkdcts 4 — 6, ovate, aggregated closely , sessile and bracteate ; perig. ovate, 

 obtusish, bifid, scabrous on the margin, plano-convex, very diverging in ma- 

 turity, about twice as long as the short, ovate, obtgsish glume. Dry fields 

 — not abundant, but common over New England and New York. In 

 hedges it is often four feet long, and subprostrate, leafy towards the base. 



22. C. SPARGANOIDES. Mltk. 



Spikclets 7 — 10, ovate, rather distant, bracteate, sessile ; perig. ovate, acute, 

 compressed, diverging, acuminate, 2-toothpd, scabrous on the margin, nearly 

 twice the length of the ovale, acute, or mucronate glume, stem about 2 ieet 

 high, with long, striate leaves. 



/3. ramea (D.) ; has one branch or more at the base, with several spikelets in 

 the pliice of the lower spikelet, and is the C. divulsa of Pursh. About culti- 

 vated and moist fields, common. 



23. C. MURICATA. L. 



Spikelets about 5, ovate, sessile, approximate, bracteate, lower ones some- 

 times remotish ; perig. ovate-lanceolate, plano-convex, 2-toothed, horizontal, 

 scabrous on the margin, sometimes longer than the ovate-lanceolate glume. 

 Fields near Boston, B. D. Greene, and common in Arctic America; Charles- 

 town, ]\lass., M. A. Curtis. 



c. Perigynia few. 

 84. C. DisPERMA. Dew. 



Spikehts 3 — 4, erect, subapproximate, lowest bracteate ; perig. ovate, obtuse, 

 about two. nerved, piano convex, short-beaked, glabrous, twice longer than 

 the ovate, acute, submucronate glume ; stem slender, G — 18 inches high, with 

 narrow and linear leaves. Pcrigiivia 1 — 2, sometimes 3. Wet woods, Newr 

 England, N. York, Michigan and Wisconsin territory. 



3« Andi-cgynoiis ; stamens at the base of the spikehts. 

 H. Perigynia radiating. 

 25. C. STELLULATA. Good. 



Spikehts 4 — 6. ovate, lemotish, sessile ; perig. broad ovate, contracted into 

 a short beak, compressed, sli<>htly bifid, scabrous on the edge, diverging and 

 reflexed, a little longer than ihe ovate, obtusish glume ; stem, erect, stiff, leafy 

 below, 8—24 inches'high. Common in wet places over the Northern States. 



