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, yellow. Leaves, clustered at the root, marked above with purple, hairy veins, colored beneath a lighter purple, all entire, without petioles. Late May to September,
A pretty, graceful, slender, not uncommon plant. The strangely marked leaves form a rosette at the root. Slender-pedicelled flowers are produced in long, loose corymbs, on scapes naked or bearing one or two small leaves 1 to 2 feet high. In open woods and sandy, shady places from Maine to Georgia and westward.