Asclepias incarnata (Swamp Milkweed)
Family: Asclepiadaceae (Milkweed)
Asclepias incarnata grows in wet places, often on the banks of streams or lakes. Dark pink flowers are at the tops of upright stems. Leaves are opposite and up to 6 inches long and 1 inch wide. Compare to Asclepias speciosa, which has thick oval leaves and paler flowers.

Vegetation zone:  Plains, Foothills  (3400 - 5500 ft.)
Time of bloom:  July - September
Origin:  Native
Eastern Colorado Wildflowers