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St. John's wort (Hypericum perforatum) Links

More by Marcel Roy

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Other St. John's wort (Hypericum perforatum) sightings

Contributors » Marcel Roy » St. John's wort (Hypericum perforatum)

St. John's wort (Hypericum perforatum) observation by Marcel Roy (#728)

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Observation on: August 11, 2011 @ 18:00 | Posted on: January 24, 2012 @ 6:14 (diff: 166 days)

John's Wort - This introduced perennial plant is 1–2½' tall, branching frequently. The round stems are hairless and light green; the larger stems have a pair of small longitudinal ridges. The opposite leaves are about 1" long and 1/3" across. They are oblong, hairless, and sessile. The surface of these leaves is perforated by numerous translucid dots, and there are often scattered black dots along the margin of the lower surface. The upper stems terminate in flat-headed clusters of several flowers (cymes). Each flower is about ¾" across, consisting of 5 yellow petals, 5 green sepals, 3 styles, and numerous stamens (more than 20).

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