130 POACEAE 
is WS Mp re Seribn. Plants yellowish-green: stem mostly erect: nerves 
of lemma pubescent. [P. c laid M rus Fl.) |—Dry open grounds, prairies 
and ee a Coastal Plain a . pr o- 
vinces, Fla. to Tex., Ia., and kh b 
2. P. a L. Plants peur glossy green: 
stem aie spreading: e pyramidal, 
38-8 cm. long: Peat x v i pue 
4 mm. long: n ves of lem su = be- 
low.— (Six €: K’S ee: PEAR- 
GRASS. )—-Open prts throughout N. A. 
Nat. of Eu.— (W. I., Mex., C. A., S. A.) 
3. P. compressa L. Stem wir y, 20—60 e 
tall, geniculate at base: panicle ed 2-8 
ng: spikelets crowded, 4—6 . lon ng, 
3- 6- flowered; lemmas obscurely id Spar- 
ingly cottony at base, the nerves pubese ent 
below.—(CANADA BLUE-GRASS.)—Dry peace soils, from Ga. and Okla. north- 
ward, “nearly throughout N. A. Nat. of Eu.—(W. I.) 
P. ara acy pein Torr. E 30-80 em. tall: panicle 5-15 em. long: spike- 
TR several-flowered: lemmas 4-5 mm. long, the nae woolly on the nerves 
and copiously cottony at t ba se.— [P. glabrescens Nash, the staminate form. |— 
Dry grounds, pinelands, prairies, and cult. gro ane ‘Coastal Plain, Tex. and 
Okla. Naturalized coe Fla. to Miss. and S. C. 
5P. e id Stem 30-50 cm. tall: panicle i em. long: spikelets 
exer the ace villous all over TP. brach yphytla md ult: P. brevifolia 
Muhl.]—Rocky woods and stream- -banks, various provinees N of Coastal Plain, 
Ga. to Ky. and N. J 
6. P. pratensis ux c up to 100 em. bond o pyramidal, 5-20 cm. long: 
spikelets 4-5 mm. long, 8-5-flowered: lemmas 3 mm. long, cottony at base, the 
nerves Dubois ent. i KENTUCKY B Puer E eui )—Open grounds and 
ui. nearly throughout N. A. (Zurasia.)—(W. I.) 
7. P. trivialis L. Stem erect from a decumbent base, up to 100 em. long, 
scabrous below the panicle: panicle 6-15 em. long: spikelets 2-3-flowe iu He 
mm. ae - as I 
Roue 
Cu. Plain, La. to S. D., "Na. and Que. Nat. of Eu. 
P. autumnalis Muhl. Stem 30-100 em. tall: leaf-blades 2-3 mm. wide: 
ana "8-20 c m. long: spikelets 4—6-flowered, about 6 mm. long. E d da 
Muhl. ]— Woods and swamps, various provinces, Fla. to Tex., Ill, and N 
9. P. sylvestris A. Gray. Stem 30—100 cm. tall: panicle 10-20 cm. long, rather 
xu the mates Roni whorled, often reflexed: spikelets 2—4-flowered, 2.5—4 
m. long: lem 2.5 mm. long, pubescent on the keel: glumes widely 2e 
ing at maturity. — Rich woods and stream-banks, various provinces, N Fla. 
Tex., Wis., and N. Y. 
10. P. alsodes A. Stem 20- s em. ove leaf-blades 2 wide: 
Pa e em. long, the branches ’s or 4’s: spikelets 2-3 T about 
o mm. long: lemmas ETE nerved, ed on the keel below.—Wooded “slopes, 
Blue > Ridge and more northern provinces, N. C. and Tenn. to Minn, and 
