Stachys palustris L.
other common names: woundwort, common woundwort, marsh woundwort, clown's woundwort, marsh hedge nettle
Stachys: from Greek, meaning "an ear of wheat or spike," referring to the terminal raceme
Palustris: meaning “of marshes"
Mint family: Laminaceae (Labiatae)
Photograph by Thomas Rosburg, Wildflowers of the Tallgrass Prairie: The Upper Midwest, Second Edition