36 GRAMINEAE 



couver Island, N. J., 111. and Neb. Also iu Eu. and Asia. — Pennsylvania: 

 Tioga ; Crawford ; Erie ; Pike ; Northampton. 



6. Poa pratensis L- Kentucky Blue-c.rass. June-grass. (Man. p. 

 139; I. "P-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. f. 4J7.) In rocky woods, N. J. and Pa. to 111., to N. C. and 

 Tenn. — Pennsylvania Delaware ; Chester ; Philadelphi.\ ; Bucks ; 

 Northampton ; Lancaster ; Huntingdon ; Franklin ; Allegheny. 



8. Poa sylvestris A. Gray. Sylvan Spe.^r-grass. (Man. p. 139. 

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

 Kans. — Pennsylvayiia : Wayne ; Bucks ; Chester, at Valley Forge, 

 Lancaster ; Philadelphia ; Erie. 



9. Poa autunmalis Muhl. Flexuous Spe.a.r-grass. (Man. p. 140 I 

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

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

 awanna ; Sullivan ; Bucks. 



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

 p. 141 ; I. v. f. 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. PANICULARIA Fabr. 



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

 Flowering scales very broad, obscurelj' 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. I ax a. 

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



2. P. Canadensis. 

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



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. neri'ata. 

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



6. P. Americana. 

 Flowering scales 2.5-3 nim. long, 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. acutijlora. 



