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    Author(s): D. Terrance Booth; Susan E. MeyerNancy L. Shaw
    Date: 2008
    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. 916-921.
    Publication Series: Agricultural Handbook
    Station: Washington Office
    PDF: View PDF  (317.0 KB)

    Description

    The bitterbrush genus - Purshia - as presently circumscribed comprises 8 species of decumbent to arborescent shrubs of interior western North America. Three are common in the United States (table 1). The type species - antelope bitterbrush - has an essentially northern distribution, whereas cliffrose has an essentially southern distribution, and desert bitterbrush occurs in parts of the geographic area where the other 2 species have overlapping distributions. Cliffrose, along with the 5 Mexican species of the genus, has been traditionally referred to the genus Cowania D. Don. Cliffrose regularly forms hybrids with antelope bitterbrush, and desert bitterbrush could be interpreted as a stabilized hybrid between these species (Stutz and Thomas 1964). In fact, molecular genetics work by Jabbes (2000) indicates that Purshia was derived from Cowania. We follow Welsh and others (1987) in treating the group as congeneric under the name Purshia.

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    Citation

    Booth, D. Terrance; Meyer, Susan E.; Shaw, Nancy L. 2008. Purshia DC. ex Poir.: bitterbrush, cliffrose. 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. 916-921.

    Keywords

    Purshia DC. ex Poir., bitterbrush, cliffrose

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