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California Invasive Plant Council.
This interactive database contains information on the plants currently included in the Cal-IPC Invasive Plant Inventory. The Inventory categorizes plants as High, Moderate, or Limited, reflecting the level of each species' negative ecological impact in California. Includes options to search for species by region and by habitat type. The database provides a better view of information on each species and allows users to download the entire Inventory as a spreadsheet.
California Department of Fish and Wildlife.
Maine Department of Agriculture, Conservation and Forestry.
University of Illinois Extension.
Technical Forestry Bulletin NRES-160.
Chicago Botanic Garden.
Maine Department of Agriculture, Conservation, and Forestry. Maine Natural Areas Program.
See also: Official 2019 Endorsement of the Advisory List of Invasive Plants (PDF | 711 KB) by the Maine Department of Agriculture, Conservation and Forestry.