Heller's Beardtongue

Summary[edit] Description: English: Scarlet Penstemon (Penstemon triflorus) is a wildflower that is endemic to the Edwards Plateau, photographed in Edwards County, Texas, USA. Photographed on 18 April 2015 by William L. Farr. Date: 18 April 2015, 10:12:24. Source: Own work. Author: William L. Farr.

Summary[edit] Description: Heller's Beardtongue (Heller's Penstemon, Penstemon triflorus, US Botanic Garden; photograph provided with permission from USBG. Date: 29 June 2007. Source: Own work. Author: TomR (Thomas Ruedas).

Penstemon 'Dark Towers', a hybrid cultivar derived from P. digitalis, P. cobaea, and P. triflorus