no TRIANDRIA. DIGYNIA. »oa. 



3 — 4-flo\vered ; florets connected together at the base by a web. 

 Glumes unequal, lanceolate, acute, 3-nerved. Corolla acute ; 

 superior valve a little shorter. Anthers purple. 

 Hab. In meadows and pastures; very common. May — July. 

 Introduced. 



9. P. trivialis L. : panicle equal, diffuse ; spikelets ob- 

 long ovate, about 3-flowered ; florets webbed at the base, 

 5-nerved ; culm and sheaths roughish; stipule oblong; root 

 creeping. Schrad. F I. Germ. I. p. 296. Willd. Spec, 

 I. p. 387. H ook. Fl.Scot.\.\>.3b. P ur s k Fl. I, p.lB. 

 Roem. ^ Schult. II. p. 534. P. stolonifera Muhl. 

 Gram. p. 139. 



Root perennial. Culm 2 — 3 feet high, sometimes throwing off 

 suckers at the base. Leaves very narrow, pale green. Sti' 

 pules much elongated ; the lower ones obtuse. Panicle large, 

 pyramidal, verticillate ; branches scabrous. Sfiikelets gene- 

 rally 3-, but frequently only 2-flowered. Glumes unequal, very 

 acute. Corolla smooth on the sides and keel ; inferior valve 

 3-nerved. 

 Hab. In moist meadows; rare in pastures. June— August. 

 Introduced. 



30. P. compressa L»: panicle contracted, somewhat 

 secund ; spikelets oblong, 3 — 6-flowered ; florets webbed \ 

 glumes nearly equal ; culm oblique, compressed ; root creep- 

 \\\^. Willd. Spec. 1. p. 397. S 7n i t h Fl. Brit. I. p. 99o 

 En^. Bot. t. 365. Mich. FL I. p. 69. Pursh Fl. L 

 p. 79. M uhl. Gram. ^.\^\. B i g. Bost. p.'ii. Roem. 

 4r Schult. 11. p. 558. 



Moot perennial, extensively creeping. Culm a foot or more iv. 

 height, often procumbent at base or remarkably geniculate. 

 Leaves short, linear, carinate, smooth and glaucous. Stipule 

 truncate. Panicle at first almost spiked ; branches geminate, 

 short and flexuous, when old a litile expanding. Glumes about 

 2-thirds the length of the lowest floret, very acute, 3-nerved, 

 serrulate on the keel ; florets slightly connected at the base by 

 a web. Corolla lanceolate ; inferior valve indistinctly 5-nervedj 

 slightly hairy on the sides and keel; superior valve very nar- 

 row, a little ciliate on the margin. Stamens 3. Styles very- 

 short. Seed oblong, obtuse, red. 

 Hab. In fields and on dry hills. June — July. Blue-grass. 



13. syheslris*: panicle loose, spreading ; spikelets 2 — 3- 

 flowered ; culm slender, nearly erect. 



Hab. In dry woods near New-York, &c. July. 



11. V. serotina Ehrh.: panicle elongated, ditfuse, at 

 length somewhat secund ; spikelets ovate-lanceolate, 2 — 3- 

 Howered ; florets a little webbed at the base, yellow at the 



