GRAMINEAE 25 



2. Oryzopsis asperifolia Michx. White-grained Mountain Rice. 

 (Man. p. 98; I. v. f. 3/6.) In woods, N. S. to B. C, N. J., Minn, and 

 in the Rocky Mountains to N. Mex. — Pentisylvania : Monroe; Lu- 

 ZERNE ; Huntingdon ; Blair ; Erie ; Somerset. 



4. Oryzopsis melanocarpa Muhl. Black- fruited Mountain Rice. 

 (Man. p. 98; I. F. /. 31 j.) In rocky woods, Vt. to Minn., N. J., Ky. 

 and Mo. — Pennsylvania: Bucks; Philadelphia; Lancaster; Luzerne; 

 Huntingdon ; Somerset ; Pike. 



20. MILIUM L. 



1. Milium effusum L. Tall MillET-grass. (Man. p. 98; I. F. /. 

 3ig.) In woods, Quebec to Mich, and Pa. — Pennsylvania : Wayne; 

 Sullivan; Mercer; Erie; Chester; Clarion. 



21. MUHLENBERGIA Schreb. 

 Panicle contracted, its branches erect or nearly so : spikelets on short pedicels. 

 Empty scales at least % as long as the spikelet. 

 Flowering scale not awned, but sometimes awn-pointed. 

 Empty scales not awned, about % as long as the flowering scale, acute. 



1. M. soboli/era. 

 Empty scales long-acuminate, awn-pointed or awned. 



Empty scales about as long as the flowering scale, sharp-pointed, about 

 3 mm. long. 2. M. Mexicana. 



Empty scales exceeding the flowering scale, usually twice as long, 

 awned, about 5 mm. long. 3. M. racemosa. 



Flowering scale long-awned, the awn usually twice as long as the scale. 

 Empty scales about equalling the flowering scale. 4. M. sylvatica. 



Empty scales M-jj as long as the flowering scale. 5. M. tenuiJJora. 



Empty scales minute, the first one often wanting. 6. M. diffusa. 



Panicle open, its filiform branches spreading or ascending : spikelets on very 

 long capillary pedicels. 7. M. capillaris. 



1. Muhlenbergia sobolifera (Muhl.) Trin. Rock Muhlenbergia. 

 (Man. p. 99; I. F. f. 320.) Rocky woods, Mass. to Minn., Va., Tenn. 

 and the I. Terr. — Pennsylvania : Northampton ; Del.\ware ; Chester; 

 Bucks ; Lancaster ; Huntingdon; Philadelphia ; Franklin. 



2. Muhlenbergia Mexicana (L.) Trin. Meadow Muhlenbergia. 

 (Man. p. 99; I. F. f. 321.) In swamps and borders of fields, N. B. to 

 western Ont., N. C, Tenn. and the I. Terr. — Pentisylvania : North- 

 ampton ; Bucks ; Chester ; Delaware ; Lancaster ; Franklin ; 

 Huntingdon ; Clearfield ; Philadelphia ; Erie ; Allegheny. 



3. Muhlenbergia racemosa (Michx.) B.S.P. Marsh Muhlen- 

 bergia. (Man. p. 99 ; I. "P./. 322.) In wet places or thickets, Newf. to 

 B. C, N. J., Mo. and N. Mex. — Pennsylvania: Chester; Bucks; 

 Lancaster ; Monroe ; Lycoming ; Crawford ; Erie ; Pike. 



4. Muhlenbergia sylvatica Torr. Wood Muhlenbergia. (Man. p. 

 100 ; I. F. f. 323.) In moist woods and along streams, N. B. to Minn., 

 N. C, Tenn. and the I. Terr. — Pennsylvania : Delaware; Chester; 

 Bucks ; Northampton ; Lebanon ; Lancaster ; Clearfield ; Phila- 

 delphia ; Monroe. 



