No other common names known.
Purple milkweed (Asclepias purpurascens), a member of the Apocynaceae (Dogbane Family), is a herbaceous perennial that grows to 3 feet tall and blooms in the spring and summer with purple/pink flowers.
Monarch Butterfly (Danaus plexippus)
Many other insects use this plant as a nectar source.
Purple milkweed is found in open areas such as fields, roadsides, and meadows. It is native to eastern and mid-western North America.
The species name refers to the purple color of the flowers (Missouri Botanical Garden).