Common Name:
Marsh St. Johnswort

Scientific Name:
Triadenum virginicum L.

Family:
St. Johnswort (Guttifarae)

Plant Description:
Marsh St. Johnswort is a perennial plant growing from 6-18 inches in height. The plant has oblong leaves occurring in an opposite arrangement on the stem. It reproduces by seed and by underground rootstocks. Plants flower in July-September. Flowers are pink in color.

Remarks:
Marsh St. Johnswort is a common invader of cranberry marshes in Wisconsin. It can be found throughout an entire bed but usually first appears along bed edges. It may difficult to control once established.