The radially symmetrical flowers of st. John's wort are small, measuring 2-2.5 cm. in width. The blooms have five rounded petals with distinctive black spots, numerous stamens, and 3 styles. Flowers are arranged singly atop the terminal shoot of the stem
The leaves are small, measuring 2.5-5 cm. in length and are light green and elliptical with distinctive, translucent spots/irregularities. Leaves are arranged in an opposite fashion along the length of the stem.
St. John's wort grows best in fields, along roadsides, and around waste areas.
St. John's wort is a medicinal plant. Commercial pill forms of the plant extract is used to treat depression. However, it causes increased sensitivity to the sun as well.
St. John's wort also causes photodermatitis in grazing animals.
This wildflower was introduced from Europe.