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MANUAL OF POISONOUS PLANTS 



Solanum trlflorwn Nutt. Three-flowered Nightshade 



Annual, low spreading, slightly hairy or nearly glabrous; leaves acute; 

 pinnatifid, 7-9 lobed; peduncles 1-3 flowered; corolla white; berries greenish 

 or inclined to blackish, about the size of a small cherry; pedicels reflexed in 

 fruit. 



Distribution. On the plains, and waste places from Nebraska and Kansas 

 to Northwest Territory and Arizona ; introduced eastward. 



Poisonous properties. Prof. Chesnut says experiments on guinea pigs show 

 that the berries are poisonous. No cases of human poisoning have been re- 

 ported. The berry is not attractive to the eye, but has an agreeable odor and 

 taste. It is therefore to be suspected in cases of poisoning which occur in 

 localities where the weed is abundant. The writer has also received complaints 

 of the poisoning by this plant from Nebraska and other western states. The 

 active constituent is, no doubt, solanin. 



Solanum rostratuni Dunal. Buffalo Bur. Sand Bur 



Herbaceous, woody when old; somewhat hoary or yellowish; 8 inches to 

 2 feet high; covered with copious stellate pubescence; the branches and stems 

 covered with sharp yellow prickles; leaves somewhat melon like. 1-3 times 



Fig. 422. Buffalo Bur (Solanum rostratuni). a, 

 branches of the plant with burs; b, yellow flowers; c 

 and d, seeds; c, very much enlarged; d, natural size. 

 The prickles cause mechanical injuries to stock. 



