Penstemon procerus subsp. pulvereus Pennell Contr. U.S. Natl. Herb. 20: 366 (1920)

Nomenclatural References

• literature : Contr. U.S. Natl. Herb. 20: 366. 1920 BHL link from IPNI metadata.
• person : Francis W. Pennell (1886-1952) Based on occurrence of standard abbreviation 'Pennell' in the authors string.
• database : IPNI record: 187689-2