GRAMINE-'E. (c.UASS FAMILY.) T);")! 



npper sheaths ; palcaj rough-hairy, unequal, awl-pointed, 2-3 times as long as 

 the rough-keeled glumes and linear grain. (Agrostis aspora, Michi. A. clan- 

 destina, Spniu/.) — Dry sandy soil, Florida, and northwai-d. July and Aug. — 

 Culms 2°- 3° high. Sheaths hairy at the throat. 



2. V. vaginseflora, Torr. Annual ; culms low, clustered, bearing con- 

 cealed panicles at every joint, the terminal one partly exserted ; leaves short, 

 smootiiish ; palea; ovate, smooth, one third longer than the smooth glumes and 

 oval grain. (Agrostis Virginica, ^[ll/tl. Crypsis Virginica, iV((«.) — Dry bar- 

 ren soil. North Carolina, and northward. September. — Culms G'-12' high. 

 Leaves 2' -4' long. 



7. AGROSTIS, L. Bent-Gkass. 



Tufted usually tender grasses, with flat and narrow leaves ; the small 1 -flowered 

 spikelets racemose on the hair-like clustered branches of the open panicle, on 

 thickened pedicels. Glumes 2, nearly equal, longer than the paleiB. Paleaj 2, 

 the lower one commonly a\vned on the back, 3-5-nerved, the upper 2-nerved, 

 occasionally minute or wanting. Stamens 1-3. Styles or stigmas 2. Grain 

 free. 



§ 1. TRICHODIUM. Upper pal ea minute or wanting, the lower awrdess, shorter 

 ^ than the unequal acute rough-keeled glumes. 



1. A. elata, Trin. Culms stout, erect; leaves flat (1"- 2" wide) ; branches 

 of the panicle flower-bearing above the middle. (A. dispar, Michx.l) — Swamps, 

 North Carolina, Curt/s. September. 1|. — Culms 2° -3° high. Panicles large 

 and diflTuse. 



2. A. perennans, Gray. Culms slender, decumbent at the base ; leaves 

 flat (l"-2"wide); branches of the panicle short, flower-bearing from below 

 the middle ; spikelets whitish. (T. perennans, Ell.) — Swamps and river-banks, 

 Florida, and northward. July and Aug. 1|. — Culms l°-2° high. 



3. A. SCabra, WiUd. Culms slender, erect ; leaves short ; branches of the 

 panicle long, liair-like, hispid, bearing tlic purple spikelets near their summits. 

 (T. laxiflorum. Ell.) — Sterile soil, Florida, and northward. June and July. 

 (j) — Panicle usually as long'as the culm. 



^ 2. AGROSTIS Proper. Upper palea manifest: the lower commonlij awned on 



the hack. 



4. A. alba, L. Culms ascending from a creeping base ; panicle spreading 

 in flower, contracted in fruit; glumes (whitish) nearly equal, rough-keeled; pa- 

 leae hairy at the base, the lower twice as long as the upper one, awnlcss or short- 

 awned. — Damp soil, Florida, and northward. Introduced. — Culms l°-3° 

 long. 



5. A. rupestris, All. Culms slender, erect; panicle small, oblong, with 

 erect smooth branches ; glumes lanceolate, nearly equal, rough-keeled ; lower 

 palea one third shorter than the glumes, short-awned below the middle, the upper 



one minute. — High mountains of North Carolina, and northward. July 



Culms \° high. 



