Asclepias Cornuti Plate No. 134. Common milkweed is now labeled Asclepias syriaca but it is featured in "American Medicinal Plants" (1887) under the name Asclepias Cornuti.
Attribution:
Illustrated by the author for "American Medicinal Plants; an Illustrated and Descriptive Guide to the American Plants Used as Homeopathic Remedies," vol. 2, by Charles F. Millspaugh, M.D.