List_of_Penstemon_species

List of <i>Penstemon</i> species

List of Penstemon species

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This is a list of the species in the genus Penstemon. They are commonly called penstemons or beardtounges in English and species will often have a common name based on both of these names. As the subgenuses have some taxonomic uncertainty the species are arranged alphabetically by name in the lists. As of 2024 there are 281 species and seven natural hybrids according to Plants of the World Online (POWO).[1] The database World Flora Online (WFO) regards all the species listed by POWO as valid, but additionally lists two natural hybrids as species and five additional species as valid.[2]

Penstemon species

These 281 species of Penstemon are considered valid by both WFO and POWO with the exception of Penstemon grandiflorus.[1][2] In both POWO and WFO it is regarded as a synonym of Penstemon bradburyi. However, P. grandiflorus continues to be widely used as the correct species name in North America including by the Flora of North America and the USDA Natural Resources Conservation Service PLANTS database (PLANTS).[3][4] It is listed as P. grandiflorus in the table with the synonym noted.

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Penstemon natural hybrids

As of 2024 these seven naturally occurring hybrids are valid according to POWO.[1] Two are considered valid species according to WFO.[2]

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Additional Penstemon species

These five species are listed as accepted by World Flora Online, but are not accepted by Plants of the World Online.[2]

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References

  1. [1]
    "Penstemon Schmidel". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 27 March 2024.
  2. [2]
    "Penstemon Schmidel". World Flora Online. Retrieved 27 March 2024.
  3. [3]
    Freeman, Craig C. (5 November 2020). "Penstemon grandiflorus - FNA". Flora of North America. Retrieved 27 March 2024.
  4. [4]
    Penstemon grandiflorus, USDA Natural Resources Conservation Service PLANTS Profile, 27 March 2024
  5. [5]
    Turner, B. L. (2010). Taxonomy of the Penstemon campanulatus complex (Scrophulariaceae) and description of a new species from its midst. Phytoneuron 31 1–5.
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