14S GEOLOGY OF OHIO. 



POLYGALA POIA'GAMA L. 



Cleveland, W. Krebs; Paiuesville, H. C. Beardslee (Cat.) 



POEYGALA SANGUINEA L. 

 Generally distributed. 



Polygala senega L. Seneca Snakeroot. 

 Apparently over the whole state. 



POEYGALA VERTICILEATA L. 

 Frequent. 



Poeygaea ambigua Nutt. ( P. verticiilcita ambigua L.) 



Marietta, J. L. Riddell (Synop. 1835) ; Paiuesville, W. C. Werner. 



LVIII. Order SIMARUBACE^E. 



290. AILANTUS. 



Ailantus geandulosus Desf. Tree of Heaven. 



Occasional in the southern half of the state. Naturalized from China. 



LIX. Order RUTACE.E. Rue Family. 



291. XANTHOXYLUM L. Prickly Ash. 



Xanthoxyeum americanum Mill. Northern Prickly Ash. Toothache Tree. 

 Generally distributed over the state. 



292. PTELFA L. Hop-tree. Shrubby Trefoil. 



Pteeea trifoliata L. 



Apparently throughout the state. 



XL. Order LINAGES. Flax Family. 



29". LINUM Touru. Feax. 



.uinum sulcatum Riddell. 



Licking Co., H. L. Jones ( Cat.) ; Dover ( Tuscarawas Co.) J. L. Riddell ( Sup. Cat); 

 Franklin Co., Moses Craig. 



Linum usitatissimum L. Common Flax. 



Fields and waste places, frequent along railroad tracks. 



Linum virginiaxum L. 



Found rather sparingly throughout the state. 



