390 MONOCOTYLEDON OUS PLANTS. 



3. T. datum Pursh: culm erect, firm; leaves narrow-linear, flat, 

 scabrous ; sheaths smooth ; panicle verticillate, a little spreading > 

 glumes nearly equal. 



HAB. Sandy swamps. N. J. Aug. If. Culm 3 feet high. 

 Panicle exsert, purple. 



4. T. montanum Torr. : culm cespitose, erect ; leaves involute, fili- 

 form, and as well as the sheaths, scabrous ; panicle capillary, loose, a 

 little spreading ; glumes equal. 



HAB. Mountains. N. Y. July. It- Culm 812 inches high. 

 Panicle elongated. 



3. POLYPOGON. Desf. 



Glume 2-valved, 1-flowered ; valves nearly equal, obtuse at 

 the end, with a long hristle. Palccc shorter than the glume ; 

 the lower one entire, with a short straight tender bristle, 

 (sometimes awnless) ; upper one bifid, toothed. Panicle con- 

 tracted like a spike. Triandria. Digynia. 



P. racemosus Nutt. : panicle dense, conglomerate, interrupted ; bris- 

 tles of the glume scabrous ; palen* unarmed, hairy at the base ; culm 

 branched. Agrostris racemosa, Mich. A. sctosa Mn/il. 



HAB. Bogs. N. S. W. to Miss. Aug., Sept. Z/. Culm 3 4 

 feet high, compressed. Leaves scabrous and somewhat glaucous, 

 flat. Panicle 2 inches long, many-flowered, interrupted below. 



4. TRICHOCHLOA. De Cand. 



Glume 2-valved, 1-flowered, very minute. Pakce much 

 larger than the glume, naked at^base; lower one convolute 

 at the base, terminating in a longlnvn not articulated. 



Triandria. Digynia. 



T. capillaris De Cand. : leaves convolute-filiform, smooth ; panicle 

 diffuse, capillary, very slender ; pedicels longer than the awns ; awns 

 3 4 times the length of the flower. Stipa sericea Mich. Pursh. 

 AgrosUs sericea MM. Ell. 



HAB. Sandy fields. Mass, to Car. June, July. U.Cvhns 

 cespitose, 2 feet high, very slender. Panicle 810 inches long, 

 glossy and purple. 



5. CINNA. Linn. 



Glume naked, beardless, 2-valved, compressed, nearly 

 equal. Palea 2, nearly equal, compressed, shortly stipitate, 

 naked at the base ; lower one inclosing the upper, with a short 

 awn near the summit. Stamen I. Monandria. Monogynia. 



C. arundinacea WiUd. : panicle large, capillary, loose ; leaves broad- 

 linear ; culm smooth. Agrostis cinna, Pursh. 



