Field Guide

Wildflowers, Grasses and Other Nonwoody Plants

Showing 1 - 5 of 5 results
Photo of a bull thistle flowerhead.
Bull Thistle
Cirsium vulgare
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.
Photo of tall thistle plants with flowers
Tall Thistle
Cirsium altissimum
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.
A cluster of white flowers with pink-tinged tips around a yellow daisylike center.
Philadelphia Fleabane
Erigeron philadelphicus
The antique belief that this plant might repel fleas gives the fleabanes their name. There are more than 170 fleabanes in the genus Erigeron in North America. This one is scattered to common nearly throughout Missouri. Native Americans used this species medicinally for a variety of ailments.
Closeup of single flowerhead of a New World aster with yellow disk florets and lavender ray florets
New World Asters (American Asters)
Symphyotrichum spp. (formerly Aster spp.)
Missouri has 24 species of New World asters in genus Symphyotrichum. Most have purple or white ray flowers and yellow disk flowers that turn reddish over time. Most bloom in late summer and fall.
Green-stemmed Joe-Pye weed flower cluster
Joe-Pye Weeds
Eutrochium spp. (formerly Eupatorium spp.)
Joe-Pye weeds have rounded clusters of pink or purplish flowers and leaves arranged in whorls on the stem. They are typically tall, robust plants growing in lowlands along streams. Missouri has three species.
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About Wildflowers, Grasses and Other Nonwoody Plants in Missouri

A very simple way of thinking about the green world is to divide the vascular plants into two groups: woody and nonwoody (or herbaceous). But this is an artificial division; many plant families include some species that are woody and some that are not. The diversity of nonwoody vascular plants is staggering! Think of all the ferns, grasses, sedges, lilies, peas, sunflowers, nightshades, milkweeds, mustards, mints, and mallows — weeds and wildflowers — and many more!