Penstemon barbatus (Cav.) Roth [ Chelone ringens Sessé & Moc.]
no HD illustration available (m1)
Penstemon barbatus (Cav.) Roth [ Chelone barbata Cav.] [Scrophulariaceae]
M. Sessé, M. Mociño, Draw. Roy. Exped. New Spain: [Hunt instutute, Turner collection no. 1067] (1787-1803)