Field Guide

Shrubby St. John’s-wort has shiny, somewhat leathery, opposite leaves, 2-edged twigs, and flowers with 5 bright yellow petals and many stamens. A shrub growing to 6 feet tall, it is scattered nearly statewide.

St. Andrew’s cross is a small, sprawling shrub up to 3 feet tall, with smooth, opposite leaves, reddish flaky bark, and distinctive yellow flowers with 4 petals. It grows in the southern half of Missouri.

Amur corktree is a non-native tree that is becoming naturalized in our state. Originally introduced for landscape planting, it has proven itself invasive in the northeastern United States and has shown invasive tendencies in St. Louis.

Bald cypress is an “evergreen” tree that is not evergreen! Like the leaves of hardwoods, its needles turn yellow in the fall and are shed. A tree associated with swamps, its impressive form also graces many public landscapes.

By far the most common native conifer in the state, eastern red cedar is useful for its aromatic, red wood and beloved for its greenery, its resinous blue “berries,” and the spicy odor it lends the outdoors.

If there’s a giant green thicket in your woods, you may have a bush honeysuckle infestation. These invasive plants are shrubby natives of Asia. In America, where they have no natural controls, they leaf out early, grow fast, spread fast, and form dense thickets that crowd out native forest plants.

Black haw is a small understory tree with beautiful fall color — deep lavender or maroon-purple, finally becoming deep rose-red. Its clusters of blue-black berries, borne on red stalks, happen to be quite tasty. No wonder it has been cultivated as an ornamental since 1727!

Don’t kid yourself about this invasive, exotic vine: Japanese honeysuckle is an aggressive colonizer that shades out native plants and harms natural communities. Learn how to recognize it!