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• Penstemon grinnellii
  Johnston, a putative hybrid between P. grinnellii and P. speciosus, and P. ×dubius Davidson, a putative hybrid between P. centranthifolius and P. grinnellii
  5 KB (503 words) - 20:35, 5 November 2020
• Penstemon centranthifolius
  from San Bernardino County, California (Wilson and Valenzuela). Penstemon ×dubius Davidson was described from Mount Lowe in the San Gabriel Mountains, Los
  4 KB (440 words) - 20:31, 5 November 2020

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