Penstemon rydbergii subsp. aggregatus (Pennell) D.D.Keck Amer. Midl. Naturalist 33: 158 (1945)

Nomenclatural References

• literature : Amer. Midl. Naturalist 33: 158. 1945 BHL link from IPNI metadata.
• literature : Keck, D. D. (1945). Studies in Penstemon VIII A Cyto-taxonomic Account of the Section Spermunculus. American Midland Naturalist, 33(1), 128. https://doi.org/10.2307/2421327 DOI link imported from Page, R. (2023). doi:10.5281/zenodo.7974720
• person : David D. Keck (1903-1995) Based on occurrence of standard abbreviation 'D.D.Keck' in the authors string.
• person : Francis W. Pennell (1886-1952) Based on occurrence of standard abbreviation 'Pennell' in the authors string.
• database : IPNI record: 187751-2
• database : The Plant List v1.1 record tro-50079702
• database : The Plant List version 1.0, record: tro-50079702