36 GRAMINBAE 



couver Island, N. J., 111. and Neb. Also in Bu. and {^sia.— Pennsylvania : 

 Tioga; Crawford; Erie; Pike; Northampton. 



6. Poa pratensia L- Kentucky Blue-grass. June-grass. (Man. p. 

 139; I. F./. 466.) In meadows and woods almost throughout N. Am. 

 Also in Eu. and Asia. — Pennsylvania : Delaware ; Chester ; Bucks ; 

 Luzerne ; Northampton ; Lancaster ; Franklin ; Huntingdon ; 

 Blair ; Erie ; Somerset ; Pike ; Allegheny. 



7. Poa brevifolia Muhl. Short-leaved Spear-grass. (Man. p. 

 140 ; I. F. /. 47T- ) 1° rocky woods, N. J. and Pa. to 111., to N. C. and 

 Teuti.— Pennsylvania Delaware ; Chester ; Philadelphia ; Bucks ; 

 Northampton ; Lancaster ; Huntingdon ; Frankxin ; Allegheny. 



8. Poa sylvestris A. Gray. Sylvan Spear-grass. (Man. p. 139. 

 I. F. /. 474.) In thickets and meadows, N. Y. to Wis., N. C, La. and 

 Eans. — Pennsylvania : Wayne ; Bucks ; Chester, at Valley Forge, 

 Lancaster ; Philadelphia ; Erie. 



9. Poa autumnalis Muhl. FlExuous SpEAR-GRASS. (Man. p. 140! 

 I. F. / 47S-) 1° woods, N. J. to Ky., FU. and Tex. — Pennsylvania: 

 Lancaster, Bart and Martic Townships ; Monroe, Indian Rock ; Lack- 

 awanna ; Sullivan ; Bucks. 



10. Poa compresea L. Wire-grass. English Blue-grass. (Man. 

 p. 141 ; I. F.y. 461.^ Waste places, cultivated grounds and woods, almost 

 throughout N. Am. Nat. from Eu. Native also of Asia. — Pennsylvania: 

 Delaware ; Chester ; Bucks ; Luzerne ; Northampton ; Monroe ; 

 Lancaster ; Franklin ; Allegheny ; Erie ; Montgomery ; Somer- 

 set ; Philadelphia; Pike. Common. 



56. PANICITLARIA Fabr. 

 Spikelets ovate or oblongr, 8 mm. long or less. 

 Flowering scales very broad, obscurely or at least not sharply nerved. 

 Panicle open, the branches spreading or ascending, often drooping. 

 Spikelets 3-5-flowered : lowest flowering scale about 2 mm. long. 



1. P. laxa. 

 Spikelets 5-12-flowered : lowest flowering scale about 3 mm. long. 



2. P. Canadensis. 

 Panicle contracted, the branches erect. 3. P. obtusa. 



Flowering scales narrow, sharply and distinctly 7-nerved. 

 Panicle elongated, its branches erect or appressed. 4. P. elongala. 



Panicle not elongated, its branches usually spreading or ascending, some- 

 times drooping. 

 Flowering scales about 2 mm. long, obtuse or rounded at the apex. 

 Spikelets 3 mm. long or less : branches of the panicle often drooping. 



5. P. nervata. 

 Spikelets 4-6 mm. long : branches of the panicle ascending or spreading. 



6. P. Americana. 

 Flowering scales 2.5-3 °"n- longi truncate and denticulate at the apex. 



7. P. pallida. 

 Spikelets linear, 12 mm. long or more. 



Flowering scales 4-5 mm. long, obtuse, equalling or exceeding the obtuse 



palet. 8. P.fluitans. 



Flowering scales 6-8 mm. long, much shorter than the acuminate palet. 



9. P. acutiflora. 



