Muhlenbergia 



Agrostideae 



133 



50 



Map 222 



Muhlenbergia mexicana (U Trin. 



513 



Map 223 



Muhlenbergia mexicana 

 f. commutata (Scribn.) Wieg. 



50 



Map 225 



Muhlenbergia racemosa (Michx.) BSP. 



6. Muhlenbergia mexicana (L.) Trin. Wirestem Muhly. Map 222. 

 This species is frequent to common in all parts of the state except in our 

 northern counties, where it becomes rare to infrequent. It prefers a moist 

 soil but will grow and thrive in almost all kinds of soils. It prefers open, 

 alluvial soil along streams where it often forms exclusive stands. It is an 

 obnoxious weed when it invades cultivated fields because it propagates from 

 underground stems. 



N. B. to N. D., southw. to the mts. of Ga. and Tex. 



6a. Muhlenbergia mexicana f. commutata (Scribn.) Wieg. (Rhodora 

 26: 1. 1924.) Map 223. I have specimens of this long-awned form from 

 the counties shown on the map. 



Maine, Que., and S. Dak., southw. to Va. and Mo. 



7. Muhlenbergia brachyphylla Bush. (Araer. Midland Nat. 6: 41-42. 

 1919.) Map 224. Probably infrequent to rare in the southern part of the 

 state. At a distance it so closely resembles Muhlenbergia tenuiflora that 



