Penstemons (Penstemon spp.) are perennial forbs, subshrubs to shrubs with attractive flowers. Common to the western United States. Except for one minor species, the genus Penstemon does not occur naturally outside of North America. They are short to long-lived. Penstemons have opposite, entire or toothed leaves. They have several stalked flowers or flower clusters that are borne in the axils of the upper leaves or leaflike bracts. The tubular flower is strongly to distinctly two-lipped at the mouth with a two-lobed upper lip and a three-lobbed lower lip. There are 4 fertile stamens and a single sterile stamen that is often hairy at the tip. The fruit is a many-seeded capsule.
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