TRIANDRIA DIGfXIA 55 



T. percnnans. Ell. Sk. Up. 99. Icox, Ell. I. c. tab. 5. f. 2, Also*. 



Bat. Man. p. 369. 



Agrostis scabra. Will d. Sp. I. p. 370. 



Also ? A. anomala. ll'illd. I. c. 



Rough Trichodium. 



Root perennial. Culm 1 to 2 feet high, geniculate at base, often somewhat de- 

 cumbent, ami branching. Leaves of nearly uniform length, (4 to 6 inches,) linear- 

 lanceolate, striate, scabrous on the margin : sheaths generally closed, smooth J 

 tigule oblong, obtuse, (acute, Muhl.) lacerate. Panicle pale green, oblong ; bran- 

 vhes scabrous, very slender, but not so long as in the preceding species, subdivi- 

 ded trichotomously two or three times, becoming horizontal, or divaricate : spike- 

 lets not clustered. Glumes with scarious margins, strongly serrulate on the keel ; 

 the lower one a little longer than the upper. Palea generally awnless ; but occa- 

 sionally with a conspicuous awn on the back* 

 Hub. Dry, open woodlands, and road sides : common. Fl. July. Fr. Sept. 



Obs. I think Dr. Gray has erred, in making this synonymous with the prece 

 ding,— as they appear to me quite distinct. Dr. Baldwin gSL\e me a specimen of 

 T. pcrennans, Ell* from Georgia, which seems to be identical with our plant. A 

 variety occurs, here, of coarser growth, with the leaves larger, and very scabrous. 

 One or two other species are enumerated in tiie U. States- The Genus is ▼try 

 nearly allied to Agrostis, 



33. AGROSTIS. L. JSfott. Gen. 68. 

 [Greek, Agros, a Field: it being eminently an occupant of fields and pastures.] 



Glumes 2, nearly equal, sometimes longer, often shorter than the pa- 

 le®, the lower one larger. Paleae 2, unequal, the lower one larger, 

 .sometimes awned, often hairy at base, enclosing the seed. 



* Palese awnless. 



1. A, vulgaris, With. Culm erect; panicle spreading, with the bran- 

 ches often smoothish, finally divaricate ; lower palea twice the size •£ 

 the upper ; ligule short, truncate. Beck, Bot. p. 387. 

 A. hispida? Willd. Sp. I. p. 370. 

 A. dispar? Mx. Am. I. p. 52. Ell. Sk. 1. p. 136. 

 A. polymorphs Gray, Gram* 2. Specim. ?io. 108. 

 Also? A. alba. Muhl. Catal. p. 10. Ejusd. Gram. p. 69. Bart. 

 Phil. 1. p. 42. 

 Common Agrostis. Vulgo — Herd's Grass. Red-top. 



Root perennial, creeping. Culm erect, or ascend in«r, 1 to 2 feet high* Leaves 

 linear-lanceolate, nerved, scabrous ; shcuths striate, smooth. Panicle mostly pur- 

 ple : branches capillary, alternately semiTerticillate, spreading, smoothish, or fre- 

 quently scabrous. Glumes smooth, except on the keel, laaceolate, acule, at length 

 expanding. Palect membranaceous, smooth at base ; the lower one nearly a* 

 long as the glumes, the upper one very small, retuse. 



Hab. Pastures, and low meadow grounds : common. /V.July. Ff. Augast. 



Obs. There is some obscurity and confusion in the descriptions of this wall' 

 known grass,— perhaps in consequence of in polymorphous character. I think it 

 is undoubtedly the A. alba, of Muhlenberg. I have dicarf specimens, from our 

 Mica-slate hills, which appear to be identical with A. vulgaris, var. pumila, of 

 FersQon ; But the common character of the plant in our meadows, U Uut of A* o#f* 



