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Results of: Search in every Kingdom for Scientific Name containing 'Penstemon attenuatus'
 
 Kingdom Plantae
  Penstemon attenuatus Douglas ex Lindl. – accepted – sulphur penstemon
  Penstemon attenuatus ssp. militaris (Greene) D.D. Keck – not accepted
  Penstemon attenuatus ssp. palustris (Pennell) D.D. Keck – not accepted
  Penstemon attenuatus ssp. pseudoprocerus (Rydb.) D.D. Keck – not accepted
  Penstemon attenuatus var. attenuatus Douglas ex Lindl. – accepted – sulphur penstemon
  Penstemon attenuatus var. militaris (Greene) Cronquist – accepted – South Idaho penstemon
  Penstemon attenuatus var. palustris (Pennell) Cronquist – accepted – sulphur beardtongue
  Penstemon attenuatus var. pseudoprocerus (Rydb.) Cronquist – accepted – small penstemon
   

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