While there are quite a few native Hypericum species (other types of st. Johnswort), the common yellow roadside flower we can currently observe, is not. Hypericum perforatum was introduced to North America in the 1700s. Its origins are in Eurasia. It has “perforatum” in its name because it seems the leaves have perforations when you hold them to the light. The dots are actually concentrations of oil. Additionally the plant’s flowers have dark dots on the edges of the petals. The flowers have been used as a reddish dye, which you can demonstrate by rubbing a petal between your fingers – it will leave a dark red stain. The plant is toxic to livestock. However, extracts of Hypericum perforatum have been recommended for a wide range of medical conditions. The most common modern-day use of st. johnswort is the treatment of depression. As for the name, people are mostly guessing about it’s origins. We do know that medieval people believed that if you slept with a sprig of st. johnswort under your pillow on St. John’s Eve (the night before St. John’s Tide), the Saint would appear in a dream, give his blessing, and prevent one from dying during the following year. Sounds like a good reason to me…
st. johnswort roadside in Cummaquid, July 1 2011
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