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Alien Plant Working Group
Plant Conservation Alliance's Alien Plant Working Group website. Invasive plants list, invasive species fact sheets.
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USDA plant database
The PLANTS Database provides standardized information about the vascular plants, mosses, liverworts, hornworts, and lichens of the U.S. and its territories.
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Native Plants for Wildlife Habitat and Conservation Landscaping - Chesapeake Bay Watershed
Publication of the U.S. Fish and Wildlife Service. Browse the web version of the brochure or download a PDF document.
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Pennsylvania Flora Database
This site will let you compile a list of plants by county based on Rhoads and Block.
Select search PA Flora Database, telling it to return only native species. Then search by county, then select the county and select native vs. introduced. You can also narrow down the search more.
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