BIBLIOGRAPHY 291 



Marsh, C. Dwight, Clawson, A. B., and Marsh, Hadleigh. Lupines as 

 Poisonous Plants. U. S. Dept. of Agr. Bui. 405, 1916. 

 Zygadenus, or Death Camas. U. S. Dept. of Agr. Bui. 125, 1915. 

 May, W. L. Whorled Milkweed. Colo. Agr. Exp. Sta. Bui. 255, 1920. 

 Pammel, L. H. a Manual of Poisonous Plants. The Torch Press, Cedar 



Rapids, la., igio-ii. 

 Swingle, D. B., and Welch, H. Poisonous Plants and Stock Poisoning 

 on the Ranges of Montana. Mont. Agr. Exp. Sta. Cir. 51, 1916. 



