North America · Herb · № 990
Butterfly weed
Asclepias tuberosa
A milkweed with bright orange flower umbels that attract many butterflies, and a thick, tuberous root. For a milkweed it contains few cardiac glycosides, but it does contain steroids that in larger amounts can cause weakness, seizures and eye damage. The root was listed in the United States Pharmacopeia as pleurisy root, an expectorant.