KEY TO GENERA AND SPECIES 



123 



wood, Dogwood, Swamp Sumach, Poison 

 Ash, Rhus Vernix L. 



NOTE. Many persons are poisoned by merely 

 handling the Poison Sumach. The poison- 

 ous principle is of an oily nature and is 

 found in every part of the plant. A good 



Fig. 232. Staghorn Sumach. Fig. 233. Dwarf Sumach. 



preventive against severe poisoning is to 

 wash the parts of the body that have come 

 in contact with the plant with strong 

 alcohol (or strong soap suds) immediately 

 after such contact; the sooner this is done 

 the more effective will be the remedy. The 

 Poison Ivy or Poison Oak (Rhus Tdxico- 

 dendron L.) climbs by means of numerous 

 dark brown roots, or trails over the ground 



