Native vascular plants listed as extirpated from the Portland area in Urbanizing Flora of Portland, Oregon, 1806-2008: https://ir.library.oregonstate.edu/concern/technical_reports/j6731792f
Native vascular plants listed as extirpated from the Portland area in Urbanizing Flora of Portland, Oregon, 1806-2008: https://ir.library.oregonstate.edu/concern/technical_reports/j6731792f
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