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Title: Penstemon Schmidel: penstemon, beardtongue
Author: Meyer, Susan E.;
Source: In: Bonner, Franklin T.; Karrfalt, Robert P., eds. The Woody Plant Seed Manual. Agric. Handbook No. 727. Washington, DC. U.S. Department of Agriculture, Forest Service. p. 774-777.
Publication Series: Miscellaneous Publication
Description: The genus Penstemon comprises about 230 species of perennial herbs and subshrubs, most of which are found in western North America. Although most of the species are herbaceous, there are many more subshrubby species than are treated here. Several shrubby species from California that were formerly included in the genus Penstemon have been transferred to the closely related genus Keckiella Straw. In the previous edition of the Seed Manual, Hylton (1974) treated these species under the name Penstemon.
Keywords: Penstemon Schmidel, penstemon, beardtongue
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Meyer, Susan E. 2008. Penstemon Schmidel: penstemon, beardtongue. In: Bonner, Franklin T.; Karrfalt, Robert P., eds. The Woody Plant Seed Manual. Agric. Handbook No. 727. Washington, DC. U.S. Department of Agriculture, Forest Service. p. 774-777.
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