Above: St. John's wort on bank of Marion Dunn Pond in Madison, Wisconsin. (6/20/20).
St. John's wort - Hypericum perforatum (Introduced/Invasive)
St. John's wort grows from 2-3' tall.
The yellow, 5-parted flower petals have black dots near the edges.
Other names: Common Saint John's wort, perforate St. John's-wort, Klamath-weed.
For more information on the St. John's wort, visit Wikipedia.
Or, visit the UW-Madison Wisconsin State Herbarium website page about St. John's wort - Hypericum perforatum.
St. John's wort
Hypericum perforatum
Above: St. John's Wort on bank of Marion Dunn Pond in Madison, Wisconsin. (6/21/21).
Above: St. John's Wort on bank of Marion Dunn Pond in Madison, Wisconsin. (7/7/19).
Above: St. John's Wort on bank of Marion Dunn Pond in Madison, Wisconsin. (7/8/19).
Above: St. John's Wort on bank of Lake Wingra in Wingra Park in Madison, Wisconsin. (7/30/19).
Above: St. John's Wort on bank of Marion Dunn Pond in Madison, Wisconsin. (6/28/20).
Above:St. John's Wort botanical illustration circa 1917-1926.
Above:St. John's Wort botanical illustration circa 1890-1893.