24 GRAMINEAB 



2. Phalails Canariensis L. Canary-grass. (Man. p. 92 ; I. V. f. 292. ) 

 In waste places, N. S. to Ont., Va. and Neb. Nat. from %y3..— Penn- 

 sylvania : Lancaster ; PHii,ADEr,PHiA ; Northampton ; Ai<i<Bgheny. 



16. ANTHOXANTHUM Iv. 

 1. Anthoxanthum odoratum L. SwEET Vernai^grass. (Man. p. 

 92 ; I. F. / 2pj. ) In fields throughout nearly the whole of N. Am. Nat. 

 from 'B,\x.— Pennsylvania : DELAWARE ; Phii<adei,phia ; Chester ; 

 Bucks ; Berks ; Monroe ; Bi<air ; 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. purpurascens. 



1. Ailstida dichotoma Michx. POVERTY GRASS. (Man. p. 94 ; I. 

 P. /. 29 J.) In dry, sandy soil. Me. to Mo., Ga. and Tex. — Pennsyl- 

 vania : DEi/AWARE ; Chester ; Lancaster ; Bucks ; Philadelphia; 

 Northampton ; Franklin ; Montgomery ; York. 



2. Aristlda oligantha Michx. Few-elowerEd ArisTida. (Man. 

 p. 95 ; I. F. f. 303.) In dry soil, N. J. and Md. to Neb., La. and Tex. — 

 Pennsylvania : Philadelphia ; Delaware. 



3. Ailstida gracilis Ell. SLENDER ArisTida. (Man. p. 95 ; I. P. 

 /. 298.) In dry soil, Mass. to Neb., Pla. and Tex. — Pennsylvania: 

 DELAWARE ; Chester ; Bucks ; Northampton ; Lancaster ; Frank- 

 lin ; Montgomery ; Philadelphia. 



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

 I. P./. JO/) In dry soil, Mass. to Minn., Pla. 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 Pla., mostly near the coast. Also in 

 western Ont. and Wis. — 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. asperifolia. 



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

 spreading. 3. O. melanocarpa. 



1. Oiyzopsis juncea (Michx.) B.S.P. SLENDER Mountain Rice. 

 (Man. p. 97 ; I. P. y! i/#.) In dry rocky places, Quebec to B. C, Mass., 

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



