Taxon - Odkazy a literatura
Kew Science - Plants of the World online 2024-05 [291169-2]
Kew Science - Plants of the World online [https://powo.science.kew.org], Facilitated by the Royal Botanic Gardens, Kew [jako Penstemon buckleyi Pennell]
Datum citace: 31. leden 2025
C. Ulloa et al. (2017): An integrated assessment of the vascular plant species of the Americas, Science. 358. 1614-1617 [jako Penstemon buckleyi Pennell]Datum citace: 19. září 2019