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Clethra alnifolia (Summersweet) is a species of tree in the family clethras. They have a self-supporting growth form. They are listed as threatened by COSEWIC. They are native to United States, The Contiguous United States, Canada, North America, and Eastern North America. They have simple, simple leaves and white flowers. Flowers are visited by Four-toothed Mason Wasp, hummingbirds, Bombus impatiens, and Scolia dubia dubia. Individuals can grow to 16 feet.

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EOL has data for 74 attributes, including:

Known occurrences, collected specimens and observations of Summersweet. View this species on GBIF