Verbatim text: Beatty, B. L., W. F. Jennings, and R. C. Rawlinson. 2004. Penstemon degeneri Crosswhite (Degener’s Beardtongue): A Technical Conservation Assessment. Denver.
Author: Beatty, B.L., Jennings, W.F., Rawlinson, R.C.
Year: 2004
Title: Penstemon degeneri Crosswhite (Degener’s Beardtongue): A Technical Conservation Assessment