Field Guide

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.

Tall thistle is a native thistle that can grow to be 10 feet tall! To identify it, notice its leaves, which are unlobed (though they may be wavy or have only shallow, broad lobes), are felty-hairy beneath, and have prickles only along the edges.

Canada thistle is a native to Eurasia and arrived on our continent probably before the Revolutionary War — most likely mixed in agricultural seed. A bad weed of crop fields and rangeland farther north, it causes problems in Missouri, too.

A big river floodplain species, decurrent false aster has declined as wetlands have been drained and converted to agricultural crop production.

There are 23 species of goldenrods in Missouri. They can be hard to identify to species, but as a group, the goldenrods are common and nearly unmistakable.

A native of Europe, cornflower is a popular garden flower that often escapes to nearby areas. It’s used in bridal bouquets and men’s boutonnieres. Its intense blue color appears in boxes of crayons!

A true lettuce that can be eaten as a cooked or salad green, Florida lettuce has lavender to purplish blue flowers and grows statewide.

Most common in the Ozarks, round-leaved groundsel is one of seven Packera species in our state. Its showy, bright yellow, daisylike flowers form flat-topped clusters that arise from sparsely leaved stems.

One of several native plants called dandelions, Carolina false dandelion is an annual with sulphur yellow flowers and puffy seedheads.