GRAMINEE. (GRASS FAMILY.) 551 
upper sheaths ; pales rough-hairy, unequal, awl-pointed, 2-3 times as long as 
the rough-keeled glumes and linear grain. (Agrostis aspera, Michr. A. clan- 
destina, Spreng.) — Dry sandy soil, Florida, and northward. July and Aug. — 
Culms 29- 39 high. Sheaths hairy at the throat. 
2. V. vagineeflora, Torr. Annual; culms low, clustered, bearing con- 
cealed panicles at every joint, the terminal one partly exserted ; leaves short, 
smoothish ; palez ovate, smooth, one third longer than the smooth glumes and 
oval grain. (Agrostis Virginica, MuAl. Crypsis Virginica, Nutt.) — Dry bar- 
ren soil, North Carolina, and northward. September. — Culms 6! - 12 high. 
Leaves 2' - 4! long. 
7. AGROSTIS, L. Bent-Grass. 
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 paler. Pales 2, 
the lower one commonly awned 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 palea minute or wanting, the lower timi; aor 
e Me piel acute Seon gp gee d 
of the panicle flower-bearing above the middle. ( A. dispar, Michz.? i — Ee 
North Carolina, Curtis. September. | — Culms 2° -3° high. Panicles large 
and diffuse. 
2. A. perennans, Gray. Culms slender, decumbent at the base; leaves 
flat (1/'-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. Y — Culms 1? - 2? high. 
3. A. scabra, Willd. Culms slender, erect; leaves short ; branches of the 
panicle long, hair-like, hispid, bearing the purple spikelets near their summits. 
(T. laxiflorum, EU.) — Sterile soil, Florida, and northward. June and Ln 
@ — Panicle usually as long as the culm. 
§ 2. AGROSTIS Pnorrn. Upper palea manifest : the lower commonly auned on 
: the back. 
4. A. alba, L. Culms ascending from a creeping i: panicle spreading 
in flower, contracted in fruit; glumes (whitish) nearly equal, rough-keeled ; pa- 
le: hairy at the base, the lower twice as long as the upper one, awnless or short- 
awned. — Damp soil, Florida, and noL HE p — Culms 19-39 
— 
5. A. rupestris, All. Culms slender, erect; panicle small, oblong, with 
erect smooth branches; glumes lanceolate, nearly equal, rough-kecled ; lower 
uei third shorter than the glumes, short-awned below the middle, the upper 
— High mountains of North. — and northwar gia 
