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Epilobium tetragonum (Square Stemmed Willowherb) is a species of perennial herb in the family Onagraceae. They have a self-supporting growth form. They have simple, broad leaves. Flowers are visited by Brown-banded carder bee, Sphaerophoria, Platycheirus peltatus, and Baccha elongata. Individuals can grow to 0.48 m.

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EOL has data for 17 attributes, including:

Known occurrences, collected specimens and observations of square-stemmed willowherb. View this species on GBIF