WEST VIRGINIA GEOLOGICAL SURVEY 369 



N. ALBUS (L.) Hook. (Prenanthes L.) 



Open woods. Hardy: near Moorefield (Gamble). Pres- 

 ton : near Aurora (Mr. & Mrs. Steele). 



N. SERPENTARius (Pursh). Hook. Gall-of-the-Earth. (Prenan- 

 thes Pursh.) 



Sandy woods. Randolph : near Cheat Bridge, ah. 3,550 ft. 

 Summers : near Hinton. Marion : near Catawba. Fayette : 

 near Nuttallburg (Nuttall). 



A M B R O S I A C E AE. 

 ( Compositae. ) 



AMBROSIA L. 



A. TRiFiDA L. Great Rag-weed. 



Moist places. Common or abundant throughout the State. 

 Var. INTEGRIFOLIA (Muhl.) T. & G. 



With the species, uncommon. Monongalia : near Morgan- 

 town. Wood : near Parkersburg. Fayette : near Nuttall- 

 burg (Nuttall). Berkeley: near Martinsburg. 

 A. ARTEMisiAEFOLiA L. Rag-weed. 



Fields and roadsides. Abundant throughout the State. 



A. BIDENTATA Michx. 



Meadows. Hardy : near Moorefield (^. 5. 5roo^j). This 

 extends the distribution of this species eastward from Illinois. 



XANTHIUM L. 



X. COMMUNE Britton. 



Dry situations. Tucker : along the Blackwater River 

 near Hendricks (Greenman 537). 

 X. SPINOSUM L. Spiny Clotbur. 



Waste lands along rivers. Kanawha : at Stockton's. 

 ^Mineral : near Piedmont. Jefferson : near Shepherdstown. 

 Wood : near Parkersburg. Berkeley : near Martinsburg. 

 Mineral: opposite Cumberland, Md. (Small). 

 X. GLABRATUM (DC) Britton. Qotbur. Cockle-bur. (X. Stru- 

 marium of Flora.) 



Low waste grounds. Monongalia, Marion and Gilmer 

 counties. Wood : near Parkersburg. Lewis : near Weston. 

 Jefferson : near Shepherdstown. 

 X. Canadense Mill. 



Low waste grounds. Common throughout the State. 



