Nuttallanthus canadensis (syn.
Linaria canadensis (L.) Dumort.,
Antirrhinum canadense L.;
blue toadflax,
Canada toadflax,
old-field toadflax) is a species of
Nuttallanthus in the Plantaginaceae family, native to eastern North America from Ontario east to Nova Scotia and south to Texas and Florida.
(Wikipedia)