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Family: Scrophulariaceae
  Genus: Penstemon

    Penstemon digitalis Nutt. ex Sims*+

        false foxglove, foxglove beard-tongue, tall beard-tongue, tall white beard-tongue
             Penstemon laevigatus Aiton f. digitalis (Nutt. ex Sims) A.Gray
             Penstemon laevigatus Aiton subsp. digitalis
             Penstemon laevigatus Aiton var. angulatus R.W.Benn.
    Penstemon gracilis Nutt.*+

        lilac penstemon, slender beard-tongue
    Penstemon grandiflorus Nutt.*+

        large beard-tongue, large-flowered beard-tongue
             Penstemon bradburii Pursh
    Penstemon gracilis Nutt. subsp. gracilis+

        lilac penstemon, slender beard-tongue
             Penstemon gracilis Nutt. var. gracilis
    Penstemon gracilis Nutt. subsp. wisconsinensis*+

        Wisconsin beard-tongue, Wisconsin penstemon
             Penstemon gracilis Nutt. var. wisconsinensis (Pennell) Fassett
             Penstemon wisconsinensis Pennell
    Penstemon hirsutus (L.) Willd.*+

        hairy beard-tongue, northeastern beard-tongue
             Penstemon hirsutus (L.) Willd. var. minimus R.W.Benn.
             Penstemon hirsutus (L.) Willd. var. pygmaeus R.W.Benn.
    Penstemon pallidus Small+

        eastern white beard-tongue, pale beard-tongue
             Penstemon arkansanus Pennell var. pubescens Pennell
             Penstemon brevisepalus Pennell
    Penstemon tubaeflorus Nutt.+

        tube beard-tongue, tube penstemon, white wand beard-tongue
             Penstemon tubaeflorus Nutt. var. tubaeflorus

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