Field Guide

Dead nettle, like its close relative henbit, is a common, weedy mint that, in early spring, can carpet wide patches of disturbed ground. Recognize dead nettle by the pyramidal look of its purple- or blue-tinted foliage.

In summer, you’re almost guaranteed to see big colonies of crown vetch along Missouri's highways. This weedy nonnative plant stabilizes the dirt after road construction but degrades our natural ecosystems.

Ironweeds are tough, grayish-green, branching plants known for their fluffy-looking clusters of reddish-purple florets. They are a familiar sight on roadsides and pastures. Identify western ironweed by the bracts at the base of the flowerheads.

Hedge parsley is an introduced plant that looks a lot like parsley. It was first collected in Missouri in 1909 and has become much more abundant in recent decades as it spreads along roadsides and railroads.

White snakeroot looks very similar to thoroughworts, but it has triangular leaf blades that are more broadly angled or rounded at the base. White snakeroot is common statewide. It’s a toxic plant if eaten, so it’s good to be able to identify it.

A stout perennial that can grow to 6 feet tall, tall thoroughwort is a member of the sunflower family that has dull white flowers and distinctive leaves that are opposite, slender, very short-stalked, and with three quite noticeable veins.

The small, cloverlike flowering heads and trifoliate leaves of black medick are clues that this plant is in the Fabaceae, the bean or pea family. An introduced, weedy species, it is closely related to alfalfa.

Bull thistle is a weedy introduction from Europe, found statewide. To tell it from our other thistles, note its stems with spiny-margined wings, and its leaves with the upper surface strongly roughened with stiff, spiny bristles.

Wild strawberry is one of the parents of the cultivated strawberry and is one of our prized native wild edibles. It’s also a valuable food for innumerable animals, and it’s attractive in native wildflower gardens.

Bird’s-foot trefoil forms low patches of bright yellow flowers along roadsides, having been planted to stabilize soil after road construction. Up close, it clearly has pea flowers. The leaves are cloverlike, with two leafy stipules at the base of each.