reed canary grass and Himalayan blackberry. It is popular in California as a garden plant. References Further reading Casebeer, M. (2004). Discover California Shrubs. Sonora, California: Hooker Press. External links Calflora Database: Physocarpus capitatus (Pacific ninebark, Western ninebark) Jepson eFlora (TJM2) treatment of Physocarpus capitatus USDA Plants Profile for Physocarpus capitatus (Pacific ninebark) UC Cal Photos gallery of Physocarpus capitatus (Pacific ninebark) capitatus Flora of Alaska Flora of British Columbia Flora of California Flora of Idaho Flora of Oregon Flora of Washington (state) Flora of the Cascade Range Flora of the Klamath Mountains Flora of the Sierra Nevada (United States) Natural history of the California chaparral and woodlands Natural history of the California Coast Ranges Taxa named by Frederick Traugott Pursh Garden plants of North America Flora without expected TNC conservation status