{1^9 FLORA OF COLUMBIA AND VICINITY 87 



45. P. Qattingeri Nash [P. capillare campestre <^3X.\..\ P. 

 capillare Gattingeri Nash]. Gattinger's witch grass. 



Old fields and open thickets, usually in poor soil; occas- 

 sional in moist places and swamps. 

 Connecticut to North Carolina, west to Missouri. 



46. P. flexile (Gatt.) Scribn. {P. capillare flexile Gatt.]. 

 Small witch grass. 



Knolls in thickets, waysides and waste places. 

 Pennsylvania to Michigan and Missouri. 



47. P. virgatum L. Switch grass. 

 Summit of Hinkson cliffs south. 



Maine to Ontario and Minnesota; Florida to Texas. 



4S. P. proliferum Lam. 



Along streams and in wet places; also as a weed in all 

 situations. It has two chief forms, the one upright with an 

 ample terminal panicle, the other \P. proliferuyn geniculatum 

 {Muhl.) Vasey] decumbent, rooting at the nodes, the lateral 

 panicles numerous and short — the more frequent form in 

 waste places. 



Maine to Florida and west to Michigan and Texas. 



49. P. perlongum Nash. 



Red clay barrens, where it is common and characteristic. 

 Illinois to South Dakota; Missouri to the Indian Ter- 

 ritory. 



50. P. Enslini Trin. \P. liTiearifolium Scribn.]. 

 Hilltops and knolls, sometimes forming the chief part of 



the sward. 

 New York to the Indian Territory. 



51. P. depauperatum Muhl. 



Dry places in open thickets and on knolls. 

 Maine to Minnesota; Florida to Texas. 



52. P. Columbianum Scribn. 



Open woods, thickets, and semi-wild fields. 

 Massachusetts to Michigan and Missouri. 



