434 MONOCOTYLEDONOUS PLANTS. 



23. C. trispcrma Dcio. : spikes 3, remote, alternate, sessile, ovate, 

 uppermost one without a bract ; fruit oblong, acute (or short-rostrate) 

 entire at the point, many-nerved, subscabrous above, somewhat di- 

 verging, longer than the oblong acute hyaline glume. 



HAB. Mountain swamps. N. Eng. June. If.. Culm 18 inches 

 high, filiform, prostrate. Whole plant pale green. Allied to 

 the preceding, but differs in the glume and fruit. 



24. C. arida Schw. <$ Torr. : spikes 8, (large) subap proximate, dry; 

 fruit elliptical, compressed, winged, terete in the middle, acuminate at 

 each end, divergingly bifid ; culm leafy. 



HAB. Meadows. Ohio, and W. June. If. Culm 23 feel 

 high. Leaves very long, dark green. Spikdcts very large, 

 gray. 



25. C. lagopodioulcs Schk. : spikes numerous, (10 16,). elliptic, 

 crowded; bract beneatli the lowest overtopping the culm ; fruit lance- 

 olate, acuminate, erect, bicuspidate, with a narrow serrulate margin, 

 twice as long as the ovate-lanceolate glume. 



HAB. Wet meadows. N. Y. to Car. May. U- Culm 12 

 or more feet high, furrowed. SpiJtes large, subcylindric when 

 young, 



26. C. scoparia. Scfik. : spikelets mostly 5, (sometimes 6 or 7, ) ovate, 

 sessile, approximate, aggregate, lowest one bracteate ; fruit ovate-lan- 

 ceolate, margined, nerved, smooth, bicuspidate, longer than the lance- 

 olate acuminate glume. 



HAB. Swamps. N. Y. Mass. S. to Car. May. U- Culm 

 1 2 feet high. Leaves long and narrow. Fruil tawny when 

 mature, not winged, 9-nerved. 



27. C. straminca W'dld. : spikes about 5, (47,) roundish, approxi- 

 mate, with short bracts at the base ; fruit roundish-ovate, rostrate, 

 compressed, broadly ovate, bidentate, serrulate, longer than the lance- 

 olate glume. 



HAB. Wet meadows. N. Y. and N. Eng. May. If. Culm 

 8 12 inches high, leafy. Spikes yellowish when mature. Fruit 

 acuminate. 



28. C.fctnea MuhL : spikes numerous, (8 10,) inferior ones dis- 

 tinct, upper ones aggregated and confluent ; fruit ovate, acuminated, 

 winged, bidentate, somewhat longer than the ovate glume. 



HAB. Marshes. Penn. to Car. June. It- Culm 2 feet high, 

 obtusely triangular, furrowed. Spikes subglobose. Glumes 

 ribbed, ciliate. 



29. C. cristata Schw. ft Torr. : spikes numerous, (8 15,) aggregat- 

 ed into a kind of head ; fruit ovate-lanceolate, winged, diverging, ser- 

 rate, longer than the ovate-lanceolate glume. 



HAB. Wet woods. N. Y. Mass. Penn. ; common. June. Zf. 

 Culm 2 or more feet high. Spikes crowded into an orate 

 ]bead. 



