24 GRAMINEAE 



2. Fhalaris Canariensis L. Canary-grass. (Man. p. 92 ; I. F./. 2g2.') 

 In waste places, N. S. to Ont., Va. and Neb. Nat. from Eu. — Penn- 

 sylvania : Lancaster ; Philadelphia ; Northampton ; Allegheny. 



16. ANTHOXANTHUM L. 

 1. Anthoxanthum odoratiim L- Sweet Vernal-grass. (Man. p. 

 92 ; I. Y.f. 2gj. ) In fields throughout nearly the whole of N. Am. Nat. 

 from Eu. — Pennsylvania : Delaware ; Philadelphia ; Chester ; 

 Bucks ; Berks ; Monroe ; Blair ; Erie ; Lancaster ; Somerset ; 

 Franklin. Common. 



17. ARISTIDA L. 



Central awn coiled at the base. i. A. dichotoma. 

 Central awn not coiled at the base. 



Spikelets over 2 cm. long : first scale 5-7-nerved. 2. A. oligantha. 

 Spikelets less than 1.5 cm. long : first scale 1-3-nerved. 



First scale shorter than the second. 3. A . gracilis. 



First scale longer than the second. 4. A. pttrpurascens. 



1. Aristida dichotoma Michx. Poverty Grass. (Man. p. 94; I. 

 F. f. 2gj.) In dry, sandy soil. Me. to Mo., Ga. and Tex. — Pennsyl- 

 vania : Delaware ; Chester ; Lancaster ; Bucks ; Philadelphia; 

 Northampton ; Franklin ; Montgomery ; York. 



2. Aristida oligantha Michx. Few-flowerEd Aristida. (Man. 

 p. 95 ; I. F. f. joj.) In dry soil, N. J. and Md. to Neb., La. and Tex. — 

 Pennsylvania : Philadelphia ; Delaware. 



3. Aristida gracilis Ell. Slender Aristida. (Man. p. 95 ; I. F. 

 /. 29S.) In dry soil, Mass. to Neb., Fla. and Tex. — Pennsylvania: 

 Delaware; Chester; Bucks; Northampton ; Lancaster; Frank- 

 lin ; Montgomery ; Philadelphia. 



4. Aristida purpurascens Poir. Purplish Aristida. (Man. p. 95; 

 I. F. y. JO/.) In dry soil, Mass. to Minu., Fla. and Tex. — Pennsyl- 

 vania: Bucks; Northampton; Lancaster; York; Franklin. 



18. STIPA L. 

 1. Stipa avenacea L. Black Oat-grass. (Man. p. 97; I. F. 

 f. 311.) In dry woods, R. I. to Fla., mostly near the coast. Also in 

 western Ont. and V^'is.— Pennsylvania : CHESTER; Delaware; Phila- 

 delphia. 



19. ORYZOPSIS Michx. 



Spikelets, exclusive of their awns, 3-4 mm. long. i. O. juncea. 



Spikelets, exclusive of their awns, 6-8 mm. long. 



Stems with the leaves mostly crowded at the base : panicle 5-8 cm. long, the 



branches 2.5 cm. long or less, erect. 2. O. asperi/olia. 



Stems leafy : panicle 15-30 cm. long, the branches 5-8 cm. long, more or less 

 spreading. 3. O. melanocarpa. 



1. Oryzopsis juncea (Michx.) B.S.P. Slender Mountain Rice. 

 (Man. p. 97 ; I. F. /. 314.) In dry rocky places, Quebec to B. C, Mass., 

 Pa. and Wis. — Pennsylvania : Monroe ; Luzerne. 



