Penstemon gracilis Nutt.
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Family
Scrophulariaceae (Magnoliophyta)
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Scientific Name
Penstemon gracilis Nutt.
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Common Names
lilac penstemon, slender penstemon, lilac penstemon
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Floras and Monographs
Penstemon gracilis Nutt.: [Book] Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.