[Wikipedia] Ecology: The species is widely recognized as a valuable pasture plant for cows, sheep, and goats. It is also known to be important in the diets of numerous wild animals, especially bears, both grizzly bears and black bears.[21] It is a host plant for the black swallowtail butterfly (Papilio polyxenes), short-tailed swallowtail butterfly (Papilio brevicauda), old world swallowtail butterfly (Papilio machaon), anise swallowtail butterfly (Papilio zelicaon), and the moths Eupithecia tripunctaria, Papaipema harrisii, Papaipema impecuniosa, Agonopterix clemensella, Agonopterix flavicomella, and Depressaria pastinacella.[ (link added by Mary Ann Machi)