TRIANDRIA DYGINIA. 307 



39. TRICHOCHLOA. 



T. capillaris : leaves convolute, filiform, smooth ; panicle diffuse, ca- 

 pillary, very slender; pedicels longer than the awns; awns 3 4 

 times the length of the flower. 



HAB. Sandy pine woods. Sept. Oct. *2|. ; Cespitose, 2 feet high, 

 slender ; panicles long, purple, very slender. 



40. ARUNDO. 



A. canadensis : panicle oblong, loose ; glumes scabrous, pubescent, as 

 long as the corolla ; corolla awned on the back ; hairs at the base 

 equalling the valves ; culm and leaves smooth. 



HAB. Bog-meadows. Aug. 1\.\ culmo 4= feet high, mostly simple; 

 inf. sheaths pubesc. ; panicle purple. 



41. PSAMMA. 



P. arenaria : panicle spiked ; calyx acute ; corolla three times as lony 



as the pappus ; leaves involute. 

 HAB. Sea-coast. Aug. 7].; roots long, creeping; culm 2 3 feet 



high, rigid ; pan. cylindrical, white ; flowers compress. 



42. ALOPECURUS. Fox-tail grass. 



A. pratensis : culm erect, smooth ; spike cylindrical, obtuse, lobed ; calyx 



ciliate, somewhat villose, connate below the middle ; corolla as long 



as the calyx. 

 HAB. Fields. June July. 1^; culm 2 4 feet high; leaves flat ; 



spik. 1 inches long ; awn twice as long as the flower ; styl. connate. 

 A. geniculatus : culm ascending, geniculate ; spike cylindrical ; glumes 



a little connate at the base, hairy on the back and margin ; corolla 



truncate ; styles free. 

 HAB. Wet meadows. June. %; root creeping ; culm 18 inches high, 



rooting below ; awn as long again as the corolla. 



43. PHLEUM. Cat's-tail grass. 



P. pratense : spike cylindric, calyx mucronate awned ; keel ciliate ; awn 



shorter than the calyx ; culm erect. 

 HAB. Fields and pastures. June Aug. % ; culm 2 3 feet high; 



leaves glauc., smooth ; anthers purple. 



44. PHALARIS. Canary-grass. 



P. americana: panicle oblong, spiked; glumes boat-shaped, serrulate; 



corolla unequal ; rudiments hairy. 

 HAB. Bog-meadows. July. Tj.; culm 2 5 feet high, terete ; 'leaves 



broad-linear ; panicle a little spreading when old. 

 P. canariensis: panicle sub-spiked, ovate; calyx boat-shaped, entire at 



the apex ; rudiments smooth. 

 HAB. Pastures. July. <v) ; 18 inches high ; bheatks inflated. 



45. ANTHOXANTHUM. Sweet-scented vernal-grass. 



A. odoratum: spike ovate-oblong; flowers pubescent, subpeduncled, 

 shorter than their awns. 

 27* 



