Penstemon azureus var. ambiguus A.Gray Syn. Fl. N. Amer. 2(1): 272 (1878)

Nomenclatural References

• literature : Syn. Fl. N. Amer. 2(1): 272. 1878 BHL link from IPNI metadata.
• person : Asa Gray (1810-1888) Based on occurrence of standard abbreviation 'A.Gray' in the authors string.
• database : IPNI record: 187187-2