Field Guide

Yellow star grass grows throughout the tallgrass prairie region. Imagine the thoughts of pioneers when they gazed upon these bright little lilies during stops along their westward journey!

Pondweeds are rooted aquatic plants with underwater leaves on long, flexible, jointed stems. Some have floating leaves, too, that are differently shaped. Missouri has about 10 species in the pondweed genus.

“It’s an odd plant,” this rattlesnake master, “with its leaves like yucca, a head like a thistle, and second cousin to the carrot.” That’s how the great prairie writer John Madson summed it up!

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.

Causasian bluestem and the closely related yellow bluestem are both aggressive, weedy degraders of pasturelands that escape cultivation and endanger native habitats. Learn more about these Old World grasses, and please don’t plant them!

Johnson grass is a native of the Mediterranean that is invasive in our country. It’s a weed that infests cropland and degrades native ecosystems, and heavy infestations are found in all the major river bottoms of Missouri.

Missouri has 276 species in the grass family, including well-known crop plants and our native prairie grasses. Distinguishing between the species can be difficult, but it’s easy to learn some basics about the group.

Yellow bluestem is a nonnative, aggressive, weedy degrader of pasturelands that escapes cultivation and endangers native habitats. It blooms in Missouri in late June to July, far earlier than our native bluestems.

Whorled milkweed has rounded clusters of small white flowers. The leaves are soft, threadlike, and grow in whorls from the stem. It occurs in upland prairies and fields.

Prairie milkweed’s full, rounded clusters of small, delicately purple-tinged flowers set it apart from other prairie milkweeds.