Besseya bullii (Eat.) Rydb., also called Wulfenia bullii (Eat.) Barnh.
other common names: Bull’s synthesis
Besseya: named for Bessey, a well-known botanist
Bullii: named for its discoverer, George Bull
Snapdragon family: Scrophulariaceae
Wildflowers of the Tallgrass Prairie: The Upper Midwest, Second Edition, by Sylvan Runkel and Dean M. Roosa, photographs by Thomas Rosburg