HOFFMANN: FLORA OF BERKSHIRE COUNTY. 217 



MILIUM. MiLLFT Grass. 



M. eflusum L. — Cool woods; rare. Summit of Greylock; 

 ledges on Mt. Harvey, West Stockbridge. 



MUHLENBERGIA. Dhop-seed Grass. 



M. foliosa Trin. — (M. mexicana 111. Fl. ed. 2 in part.) 



Moist thickets, dry banks and rocky ledges; frequent in the valley. 

 Not noted on the plateau. 



M. MEXICANA (L.) Trin. — Sandy soil, gravelly shores, riverbanks, 

 shaded roadsides; common. 



M. racemosa (Michx.) BSP. — Low meadows and marshes; com- 

 mon in the valley. Not noted on the plateau. 



M. Schreberi J. F. Gmel. Dkop-seed. — Dry woods and shaded 

 roadsides; occasional. Stockbridge; Alford; New Marlboro. 



M. sobolifera (Muhl.) Trin. — Dry, rocky woods. New Marlboro. 



M. sylvatica Torr. — {M. umbrosa 111. Fl. ed. 2.) 



Rocky or swampy woods; frequent. Both the awnless and the 

 long-awned forms occur. Not noted on ^e plateau. 



M. tenuiflora (Willd.) BSP. — Rocky woods; frequent. Not 

 noted on the plateau. 



ORYZOPSIS. Mountain Rice. 



O. asperifolia Michx. — Dry wooded banks and alluvial thickets; 

 frequent in the valley; occasional on the plateau. 



O. pungens (Torr.) Hitchc. — Top of Monument Mt., Great Bar- 

 rington, in disintegrated quartzite. 



O. racemosa (Sm.) Ricker. — Rocky woods, in rich soil; common 

 in the valley. Not noted on the plateau. 



PANICUM. Panic Grass. 



Key to Panicum. 

 a. Annuals. 



Panicle more than half the length of the entire plant. 



P. capillare, var. occidentale. 

 Panicle not over one-third the length of the entire plant .... P. Tuckermani. 

 a'. Perennials. 

 6. Basal leaves similar to oulm-Ieaves, not forming a winter rosette. 



P. agrostoides. 

 b'. Basal leaves usually distinctly different from the culm-leaves, forming 

 a winter rosette. 



