Phlox pilosa L.
other common names: downy phlox
Phlox: from Greek for "flame," and ancient name for Lychnis that was later transferred to this genus
Pilosa: from Latin, meaning "softly hairy"
Phlox family: Polemoniaceae
Photograph by Thomas Rosburg, Wildflowers of the Tallgrass Prairie: The Upper Midwest, Second Edition