110 



MANUAL OF POISONOUS PLANTS 



same genus. The herbage is said to be acrid and caustic. The juice of some 

 species of the genus causes blisters, or even ulcers. The fresh leaves of the 

 C. erecta are used as a vesicant in Europe, especially by beggars, hence some- 

 times called beggar's weed. 



Clematis Fremonti Wat. Clematis. 



Common from Missouri to Kansas. 



Clematis Pitcheri Torr. & Gray. 



From Southern Indiana to Texas. 



Clematis ligusticifolia Nutt. 



Very abundant in the Rocky Mountains west to the Pacific Coast along 

 streams at a lower altitude. Greshoff reports saponin in a large number of 

 species, notably C. Pitcheri, C. recta, and others; also hydrocyanic acid in C. 

 Fremonti. 



Fig. 19a. Common Crowfoot (Ranunculus acris). An acrid poison. (U. S. Dept. Agr.). 



Ranunculus acris L. Tall buttercup. 



Poisonous, causes inflammation when it comes in contact with mucous mem- 

 brane. Rarely found in Iowa, but sometimes naturalized; common eastward' 



Ranunculus septentrionalis Poir. Creeping Buttercup. 



Widely distributed in low grounds. Acrid like the preceding species. 



Ranunculus fascicularis Muhl. Tufted buttercup. 



Found in eastern Iowa, as far west as the Iowa River ; common north and 

 east. Probably poisonous like the preceding species. 



