Common St. Johnswort – Hypericum perforatum

Common St. Johnswort in a field

Common St. Johnswort in a field

Common St. Johnswort flower

Common St. Johnswort flower

Opposite leaves of Common St. Johnswort

Opposite leaves of Common St. Johnswort

Young Common St. Johnswort plants

Young Common St. Johnswort plants

Common St. Johnswort flower petal margin

Common St. Johnswort flower petal margin

Transparent dots visible on leaf

Transparent dots visible on leaf

Common St. Johnswort

Hypericum perforatum L.
Clusiaceae (St. Johnswort family)

Life cycle
Multistemmed, shrublike perennial.

Leaves
Opposite, narrow oval to oblong leaves have round to pointed tips and entire margins, and attach directly to the stem. Leaves are covered with small, transparent dots when viewed against the light.

Stems
Erect with numerous branches and up to 3 feet tall. Herbaceous stems are often reddish in color and become woody at the base with maturity.

Flowers and fruit
Bright yellow to orange-yellow flowers with five petals are approximately 0.75 inch wide, often with several black dots along the petal margins. Fruit are capsules with three cells containing numerous dark brown to black, cylinder-shaped seeds.

Reproduction
Seeds and short runners.