Haplopappus heterophyllus

Eupatorium rugosum) of the midwest and rayless goldenrod Haplopappus heterophyllus) of the southwest (Cheeke, 1998). Both are highly toxic to humans and animals and numerous poisonings have occurred. 

Jimmyweed Haplopappus heterophyllus 1 High alcohol tremetol CNS depression... 

Compounds with similar structure have been implicated in cases of livestock and human poisoning by Eupatorium rugosum, white snakeroot, in the eastern United States (Beier and Norman, 1990 Beier et al., 1987). This plantpoisoning syndrome was once a major problem and was considered an illness, often called milk sickness (Beier and Norman, 1990 Kingsbury, 1964). The lipophilic compounds of white snakeroot are excreted by lactating animals, usually cattle. In the southwestern United States, where white snakeroot does not grow, another species. Isocoma wrightii (syn. Haplopappus heterophyllus), has... 

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