This section is from the book "Harper's Guide To Wild Flowers", by Caroline A. Creevey. Also available from Amazon: Harper's Guide To Wild Flowers.
Color, pink, or rarely white. Flowers, numerous on the upper branches. Leaves, with toothed margins, petioled or sessile, lance-shaped, acute at apex, tapering at base. Stem and leaves purplish. Plant, covered with whitish hairs in lines or streaks, 1 to 3 feet high. Seeds furnished with a tuft of brown hairs. July to September.
Low, moist grounds, Maine to Wisconsin and southward. Found 2,000 feet high in Virginia.