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Frank Mayfield   cc-by-sa-2.0

Hypericum ascyron (Great St. Johnswort) is a species of perennial herb in the family Hypericaceae. They have a self-supporting growth form. They are native to The Contiguous United States, Canada, and Australia. They have simple, broad leaves and yellow flowers. Flowers are visited by Psen, Ancistrocerus, Paradidyma singularis, and Spilomyia longicornis. Individuals can grow to 5 feet.

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EOL has data for 69 attributes, including:

Known occurrences, collected specimens and observations of great St. Johnswort. View this species on GBIF