148 GEOLOGY OF OHIO. 



POLYGALA POLYGAMA L. 



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



POLYGALA SANGUINEA L. 



Generally distributed. 



POLYGALA SENEGA L. Seneca Snakeroot 

 Apparently over the whole state. 



POLYGALA VERTICILLATA I,. 

 Frequent. 



Polygala ambigua Nutt. [P. verticiUata-ambig-uaT-,.) 



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



LVIII. Order SIMARUBACE^E. 



290. AILANTUS. 



AilanTUS GLANDULOSUS 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. 



Xanthoxylum amERICAnum Mill. Northern Prickly Ash. Toothache Tree. 

 Generally distributed over the state. 



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



Ptelea trifoliata L. 



Apparently throughout the state. 



XE. Order LINAGES. Flax Family. 



293. LINUM Tourn. Flax. 



LlNUM 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 virginianum L. 



Found rather sparingly throughout the state. 



