Robuta

https://www.rhs.org.uk/plants/315696/penstemon-aff-cyananthus/details Penstemon aff. cyananthus | /RHS penstemon aff cyananthus rhs https://www.rhs.org.uk/plants/233325/cyananthus-flavus/details Cyananthus flavus | /RHS cyananthus flavus rhs