From the Greek "deca" for ten and "odus" for tooth; "verticillatus" from the the greek word meaning "whorled".

Perennial, shrubby herb, a rare part of the northern Tallgrass region, being found only on the Paleozoic Plateau in Allamakee County. Can grow to six feet at the edges of pools or streams. Purple flowers on short stalks have five petals up to a half-inch long. Blooms from July into August

Edible Uses: Unknown

Medicinal Uses: Unknown

Herbal Uses: Unknown