CYPERACE^. 



414 



9. C. vuLPiNOiDEA. Mx. C. vulplneformis. Tuckerman. C. multiflora. Muh, 

 Spikelets ovate-oblong, obtuse ; spike decompound, bracteate, conglomerate ; 



verig. ovate, acuminate, densely imbricate, bifid, triply nerved, diverging, a 

 little shorter than the ovate-cuspidate glume ; stem obtusely triangular, roand 

 and leafy towards the base. Common in fields. 



/3. micros perviiL. (D. C. microsperma. Wahl.) ; spihelets closely aggre- 

 gated ; whole spike less compact ; perig. more convex, shorter, less acuminated 

 into a beak, very abundant. Grows with the other, in dry and moist situations. 



10. C. SETACEA. Dewey. 



Spikelets ovate, alternate, obtuse, conglomerate, bracteate; perig. ovate- 

 lanceolate, acuminate, compressed, bifid, some diverging, about equal to the 

 ovate-lanceolate avvned glume ; stem 2 feet high, acutely triangular, scabrouB 

 above and striate. Wet places — not abundant. 



11. C. MUIILENBERGII. Sc/lk. 



Spikelets alternate, obtuse, approximate, with a long bract at the lower one ; 

 peri<r. ovate, convex above, very smooth, nerved, bifid, scabrous on the mar- 

 gin,°some diverging, a little shorter than the ovate and mucronate glume ; 

 .Hem 12 — 18 inches high. Jn fields, not very common, readily distinguished 

 from the three preceding and following. 



12. C. CHORDORnHIZA. L. 



Spikelets 3 — 5, aggregated into a head, ovate, sessile ; perig. ovale, acumi- 

 nate, subrostrate, convex above, equaling the broad, ovate and acute glume ; 

 stem branching towards the base and sending out roots at the joints ; spikes 

 rarely bearing only stamens. Marshes. JNew York; common — SarLwell. 

 Michigan — Cuoley. 



13. C PRAKisA. Dew. 



Spile: below branched ; spikdds ovate, sessile, .5 — 7 on a branch ; perig. 

 ovate-lanceolate, convex both sides, scabrous on the margin, slightly bifid, 

 equaling the ovate-lanceolate glume ; stevi 2 — 3 feel high, leafy towards the 

 base. Abundant in the prairies of Michigan, and sparingly found in N. Eng- 

 land and N. Y. Resembles C. puniculata. L. which has a much broaderovate 

 wlume, shorter than the perigynium and is far more paniculate, and for which 

 this has been taken. 



14. C. TERCTIUSCULA. Good. 



Spikelets ovate, acute, sessile, decompound, brownish, lower one bracteate ; 

 .erig. ovate, acute, convex and gibbous, scabrous on the edge, spreading, 

 _onger than the ovate and acute glume ; fruit brown ; stem 16 — 36 inches 

 high, leafy towards the root. Wei places, common, in tufts. 



15. C. DECOMPOSITA. Maid. 



S/n^te decompound or paniculate; spikelets very many, ovate, alternate; 

 perig. ovate, convex on both sides, triangular, acutish or short-rostrate, short, 

 brownish, glabrous, about equal to the ovate and acuminate, whitish glume; 

 iifm 18— 30 inches high. Found in swamps, Michigan, and in Yates Co., 

 N. York. Sarticell. 



16. C. PANICri.ATA. L. 



Spike paniculate, often dioBcious, long and spreading ; spikelets ovate, sessile, 

 fi — ]S on a branch below, short bracteate; perig. ovate, acute, gibbous, nerv- 

 ed, 2-toothed, brownish or tawny, 2-toothed, serrulate on the margin, a little 

 shorter than the broad-ovate, short-acute glume ; stem 2 feet high. Found in 

 Nortiiern America, and hardly known in the United States. 



to, Perigynia radiuting. 

 17. C. Ro'sEA. Schk. 



Spike'ets 3 — 5, subremote, sessile, alternate, stellate, even before maturity, 

 lowest long bracteate ; perig. oblong-lanceolate, 5 — 12, convex above, scabrous 

 on the margin, 2-toothed, very diverging or even reflexed, twice as long as 

 the ovate-obtuse glume ; siem8 — 16 inches high. 



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