Common St. Johnswort (Hypericum perforatum L.)

Clusiaceae (Mangosteen Family)

Synonym(s):Klamathweed, St. John’swort

Base Flower Color: Yellow
Reproductive Phenology: Jun, Jul, Aug, Sept
Notes: A single plant may produce up to 100,000 seeds per year. Seeds buried in soil may last for 10 years. Animals that eat St. Johnswort and then are exposed to direct sunshine develop severe sunburns that are seen as skin irritations in non-haired or white areas.

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