Field Guide

The smooth, finely divided, fernlike foliage of pale corydalis is similar to that of the related wildflower Dutchman’s breeches. But in pale corydalis, the small yellow flowers appear tubelike and lipped.

These two species of sweet clover are present all over America. Although they have been planted for forage, as bee plants, and as nitrogen-fixers, white and yellow sweet clover are now classified as invasive for their weediness and the problems they pose for natural habitats.

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.

The flowers of southern wild senna don’t look much like typical pea-family flowers, but its leaves and bean pods show the family resemblance. Look for it in moist situations, mostly south of the Missouri River.

Similar to kudzu, Chinese yam is an aggressive vine that overtakes nearly everything within reach that stands still long enough! Learn more about this invasive plant — and please don’t plant it!

Three species of yucca grow wild in Missouri. Spanish bayonet was introduced from the Southwest and has escaped from cultivation, but our two soapweeds are native.

Large stands of wind-pollinated giant ragweed commonly form in disturbed areas, causing late-summer misery in the form of hay fever for many Missourians.

Horse nettle is a native perennial with spiny stems and leaves, white to purplish flowers, and toxic fruits that look like tiny yellow tomatoes. It does well in disturbed habitats, and many people consider it a weed.

Hoary puccoon's small, tubular flowers arise on spirally condensed stalks that uncoil and elongate as more flowers open toward the tip. Occurs nearly statewide in prairies, glades, pastures, roadsides, and other open areas.