Japanese Spiraea Resources
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Search HelpPennsylvania Department of Conservation and Natural Resources.
See also: Invasive Plant Fact Sheets for plant species (trees, shrubs, vines, herbs and aquatic plants) that have impacted the state's natural lands
USDA. ARS. National Genetic Resources Program. GRIN-Global.
Google. YouTube; Lower Hudson Partnership for Regional Invasive Species Management (New York).
An official website of the United States government.