Asclepias incarnata subsp. incarnata
Family: Apocynaceae
Swamp Milkweed
Asclepias incarnata subsp. incarnata image
From Flora of Indiana (1940) by Charles C. Deam

Infrequent to common throughout the state in roadside ditches, along streams and railroads, on the borders of lakes, ponds, and swamps, and in low, open woodland and sometimes in fallow fields.