Field Guide

Tickseed sunflower has flattened black seeds that attach themselves to clothing and pets via two needlelike awns. In flower, it grows in massive displays in moist bottomlands.

Narrow-leaved vervain is a short, slender perennial with single stems or with upper stems sparingly branched. Its many small flowers are crowded on narrow spikes. The corollas are tubular, deep lavender or purple, with 5 spreading lobes.

Sometimes called wild oregano, dittany, like true oregano, is a member of the mint family and can be used as a culinary herb and in teas. Look for it on dry, wooded slopes in Ozark counties.

Shepherd’s purse is a plant that started in Europe and western Asia and has been introduced nearly worldwide. Like the common dandelion, it has several adaptations that make it a successful colonizer of disturbed soil.

A spiny annual with bright yellow flowers and dandelion-like leaves, buffalo bur is an introduced member of the nightshade family.

Common ground cherry is closely related to the tomatillo, which you’ve probably seen in the grocery store or had in a delicious salsa verde at a Mexican restaurant. The fruits of ground cherry are edible, too.

Pretty but poisonous, jimsonweed has white goblet-shaped flowers that open around midnight. This native of tropical America was introduced nearly throughout the United States and thrives in disturbed soils.

Prickly sida, a weedy plant seen along roadsides, streambanks, and the edges of fields, is in the same family as hibiscus, okra, and hollyhocks. A small, spinelike projection grows at base of each leaf.

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.

Ox-eye daisy, though familiar, is not native to North America. It was introduced long ago from Eurasia. Common in grassy uplands, pastures, fencerows, and roadsides, it can colonize aggressively in the garden.