Subgenus
Penstemon
Penstemon rattanii. Photo: (c) David Greenberger, some rights reserved (CC BY-NC-ND)
Penstemon /ˈpɛnstɪmən/, the beardtongues, is a large genus of roughly 250 species North American and East Asian flowering plants. Formerly placed in the Scrophulariaceae family by the Cronquist system, new genetic research has placed it in the vastly expanded Plantaginaceae family.
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