MONOCOTYLEDONS AS POISONOUS PLANTS 53 



can species of Cypripedium. It is found in woods and swamps from Nova 

 Scotia, Ontario and Georgia west to Minnesota and Iowa. The glandular 

 hairs on the leaves, stem and flower parts secrete a poisonous oil which 

 produces an irritation of the skin, or a dermatitis. Mac Dougal, who 

 first reported such poisonous action, experimented personally with a 

 mature specimen and states "a slight tingling sensation was felt at the 

 time, and, fourteen hours later the arm was greatly swollen from the shoul- 

 der to the finger tips. The portion covered by the plant was' violently 

 inflamed and covered with macules, accompanied by the usual symptoms 

 of dermatitis and constitutional disturbances." Nestler discovered that 

 the secretion of these hairs was a fatty acid readily soluble in alcohol and 

 benzol. No specific antidote has been discovered. 



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