1. The Mexican whorled milkweed (Asclepias mexicana) as a poisonous plant;Marsh;USDA Bull,1921
2. A new poisonous plant, the whorled milkweed (Asclepias verticillata);Glover;Colo Agric Exp Sta Bull,1918
3. Poisonous properties of the whorled milkweeds Asclepias pumila and A. verticillata var. geyeri;Marsh;USDA Bull,1921
4. The North American species of Asclepias L;Woodson;Annals Missouri Bot Gard,1954
5. Experimental intoxication in !sheep by Asclepias;Ogden,1992