Taxon - Odkazy a literatura
Kew Science - Plants of the World online 2024-05 [187205-2]
Kew Science - Plants of the World online [https://powo.science.kew.org], Facilitated by the Royal Botanic Gardens, Kew [jako Penstemon barnebyi N.H.Holmgren]
Datum citace: 1. únor 2025
C. Ulloa et al. (2017): An integrated assessment of the vascular plant species of the Americas, Science. 358. 1614-1617 [jako Penstemon barnebyi N.H. Holmgren]Datum citace: 1. duben 2020