10 TRIANDRIA. DIGYNIA. 



I.. vmoiNiCA. Ell. Panicle lax, branches sparse? keel of the glumes spariugly ciliate. 

 Vulgo — White grass. 



Fl. Latter end of August. Fr. mat. Last of September. 



Hub. Woodlands, and moist places : WoUerton's woods: frequent. 1^ to 2 feet high. 

 L. ORYzoiDEs. Panicle diffuse, large; leaves lanceolate; keel of the glumes conspicuously ciliate. 

 Vidgo—C-di grass. Wild Rice. 



jP/. Latter end of August. JPr. ma^ Beginning of October. 



Hab. Sluggish rivalets, and wet places: frequent. 3 to 5 feet high. 

 Obi. This is a remarkably rough grass; somewhat resembling rice in its habit, as the specific name imports. 



35. AGROSTIS. Nutt. Gen. 68. 

 . [Gr. Agros, a field; being eminently an occupant of fields and pastures.] 

 Cal. 2 valved, valves acute. Cor. 2valved. S^hVnias longitudinally hispid, or plumose. 



§1. Awned. 

 A. sTRiCTA. MiM. Panicle long, upright; awn at the base of the petal, twisted, longer than the flower. 

 Ft. Middle of Way. Fr. mat. 



Hub- Sterile spots: Barrens, at R. gtrode's: frequent. About a foot high* 



§ 2. Without awns. 

 A. VULGARIS. MuU. Panicle long, finally diffuse, purplish; branchlets scabrous. 

 Valgo — Herd's grass, lied top. 



Fl. Latter end of June. Fr. mat. Latter end of July. 



Hah. Fields and pastures; Patton's fields; frequent. 1 to 3 feet high. 

 A. Ai^BA. MtM. Stem geniculate, assurgent; panicle lax: ligula white, 4 parted. 

 Fit/go— Herd's grass. 



Fl. Latter end of June. Fr. mat. Latter end of July. 



Hab. Fields, and low meadow grounds: frequeat. 1 to 2 feet high. 



Obs. Both this and the foregoing vary considerably in appearance, especially in the color of the P&r^jcley, 

 and I thnik are confounded, by our farmers, under the conrmon names of Herd s grass, and Ked top. 1 hey 

 have been cultivated occasionally, but are not much esteemed; except m swampy grounds, with a view to 

 render them liroi. This species is said to ai&rd good materials for the manufacture of imitation Leghorn 

 bonnets. 



A. LATERIFLORA. Mr. Panicles terminal and lateral, compact; glumes all acuminate ; ligula lacerate, obtuse. 

 Fl. Latter end of August. Fr. mat. Last of September. 



Hub. Woodlands; and borders of fields: frequent. 1 to 2'feet high. 



Obs. Thisseem's tobe'the A. mexicana, of Muhlenberg. 

 A. vlRGiNicv. MM. Panicle spike-form; leaves subulate, involute, rigid; mouth of the sheaths pilose. 

 SijnOn. A. pungens. Ph. i 



Fl- Middle of x\ugust. Fr. mat. Middle of September. A 



Hub- Dry, sterile hills: near the Grove tavern: frequent. About a foot high. | 



T!!. CALAMAGROSTIS. Nutt. Gen. 70. 

 ■rCompounded of Calamus, a reed, and Agrostis; embracing plants allied to those.] 



Cal. 2 valved, acuminate. Cor. 2 valved, ^^ ith a h:iiry, or woolly involucellum at base. 

 V riNNoroES. Bart Fl Phil- Panicle oblong, appressed; valve of the corolla awned on the back. 

 Synon. C. canadensis. Nutt. Arundo cinnoides. MM. A. canadensis.' Mx. P^u/ffO-Reed-grass. 

 Fl. Begianing of August. Fr. mat. 



jrab Borders of rivulets, on the Barrens: rather scarce. 2 to 3 feet high. 



0?,s. Compare this with the Jgrostis glauca, of Muhlenberg. I am strongly inclined to the 'opini( 

 that they are really not distiiict. 



^ ■^. ARISTIDA. Nutt. Gen, 85. 



[Lat. Arista, an awn, or beard, characteristic of the genus.] 

 C 4L 2. valved. CoR. 2 valved; interior valve very small; exterior with 3 terminal awns. 

 A. OTCHOTOMA. Ell. Stem setaceous erect, branching; lateral awns short, middle one contorted. 

 Kii/ffo— P overt v-grass. Beard-grass. 



Fl. Latter end of August. Fr. mat^ Last of September. 



Hah. Sterile, sandy banks, and roadsides: common. 6 to 18 mches higb. 



Obs The name, dlchotoma, as Mr. Elliott suggests, is not strictly appropriate. 



