86 UNIVERSITY OF MISSOURI STUDIES [228 



38. A. Sorghum vulgaris (Pers.) Hack. [^. Halepensis 

 sativus Hack.: Sorghum vulgare Pers.]. Sorghum. 



Persisting in fields after cultivation. 



Africa and Asia; cultivated in all warm lands. 



39. A. avenaceus Michx. [Sorgkastrum avenaceum (Michx.) 

 Nash: Sorghastrum nutans (L.) Nash: C. avenaceus 

 (Michx.) Benth.: C wa/^«j(L.) Benth.]. Indian grass. 



Dry fields and open thickets; frequent. 

 Ontario to Manitoba; Florida to Arizona. 



25. PASPALUM L. 



40. P. setaceum Michx. 



Fields, yards and roadsides; common. 

 New Hampshire, Michigan and Florida to Missouri 

 and Tex.\s. 



26. PANIOUM L. [SYNTHERISMA Walt. : 

 ECHINOCHLOA Beauv.]. Panic grass. 



41. P. filiforme L. \S. filiformis (L.) Nash]. Wire 

 grass. 



Red clay hill south across Hinkson creek. 

 New Hampshire to South Carolina and the Indian Ter- 

 ritory. 



4.2. P. sanguinale L. \S. sanguinalis (L.) Nash]. 

 Crab grass. 

 Cultivated fields, gardens and waste places. 

 Europe, thence throughout the world. 



43. p. Crus-galli L. \E. Crus-galli (L.) Beauv.]. Barn- 

 yard grass. 



Yards, fields, waste places, and about ditches and puddles; 

 very variable in the length of the awns and the color of the 

 panicle, as well as in the hairiness of the sheaths. 



Europe, thence throughout the world. 



44. P. capillars L. Old witch grass. 



A common autumnal weed in fields and waste lands. 

 Nova Scotia to British Columbia; Florida to California. 



