240 ECONOMIC BOTANY OF ALABAMA 



Toxicodendron goniocarpum, (jreene.* (Khiis radicans, L., in 

 part). Poison Ivy. 



A well-known vine, with smooth ternate deciduous leaves, 

 attaching itself to rocks, trees, fence-posts, etc., by innumerable 

 rootlets, and climbing often to the tops of trees. Stems occasion- 

 ally three inches in diameter (Fayette County), but usually less 

 than an inch. Blooms in May. 



This is one of the commonest and best known poisonous plants 

 in North America. All parts of it contain a non-volatile oil, tox- 

 icodendrol. which produces an intense irritation of the skin, caus- 

 ing small blisters, which usually last several days. Some people are 

 immune to it, though, and cattle seem to eat the leaves with im- 

 punity. The fresh leaves were formerly officinal in the U. S. 

 Pharmacopoiea. , 



References : — Grant & Hansen, McAtee. 



Grows in rich woods and swamps, and occasionally along 

 fences and in yards (not as frequently here as around New York, 

 though). Like nearly all other woody vines, it seems to require 

 almost complete protection from fire ; which suggests a method 

 of eradicating it where its presence is not desired. It is common in 

 nearly all parts of the state. 



lA. Along Tennessee River, Colbert County. 



IB. Limestone slopes, etc., Madison and Morgan Counties. 



IC. Colbert, Lawrence and Morgan Counties. 



2A. Cullman, Marshall, Blount and Etowah Counties. 



2B. Walker, Jefferson and Tuscaloosa Counties. 



3. Frequent throughout. 



5. Cleburne, Clay, Coosa and Elmore Counties. 



6A. Frequent throughout. 



6B. Bibb and Autauga Counties. 



6C. Greene and Hale Counties. 



7. Frequent. 



8. Marengo and Pike Counties. 

 lOE. Pike and Coffee Counties, 

 low, 11. "Frequent. 



12. Geneva County. 



13. Escambia and Covington Counties. 



14. Common in upper part of the delta. 



Toxicodendron quercifolium (Steud.) (jreene.* {Rhus Toxi- 

 codendron, L., in part). Poison Oak. 



A much smaller plant than the preceding, growing erect and 

 about two feet tall, with leaflets thicker, coarsely toothed, and 



^Leaflets, 1 :127. 1905. 



