Content tagged with "weed"

Johnson Grass

Photo of Johnson grass flower clusters
Sorghum halepense
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. More

Johnson Grass

Photo of Johnson grass, big clump next to a field
Johnson grass is a tall, coarse, perennial grass with stout rhizomes. It grows in dense clumps or nearly solid stands in crop fields, pastures, abandoned fields, rights-of-way, and forest edges and along stream banks. More

Johnson Grass (Flower Clusters)

Photo of Johnson grass flower clusters
The flower clusters (panicles) of Johnson grass are large, loosely branched, purplish, and hairy. The spikelets (the small flowering units) occur in pairs or threes, and each has a conspicuous awn. It blooms June through November. More

Johnson Grass Infesting A Crop Field

Photo of Johnson grass infesting a crop field
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. More

Leafy Spurge

Photo of leafy spurge seed heads
Euphorbia esula
When you consider the negative effects this plant has on natural habitats, and how hard it is to control or eradicate, you almost want to rename it “leafy scourge”! This invasive plant is spreading in our state. Learn how to identify it. More

Leafy Spurge (Seed Heads)

Photo of leafy spurge seed heads
Leafy spurge is an invasive plant that is spreading in our state. Leaves are usually alternate, but those immediately beneath the flowers are whorled. Leaves on the lower half of the stem are scalelike, while those on the upper parts are linear to oblong. All parts of the plant bleed a milky sap that causes skin irritation. Flowers are borne in umbels and appear greenish yellow. More

Reed Canary Grass

Photo of several reed canary grass plants with flowering heads
Reed canary grass is native to Europe, Asia, and North America, and it varies quite a bit. Our native Missouri version, for instance, is quite different from the Eurasian type that has been widely introduced—and which has proven to be highly invasive. More

Reed Canary Grass

Photo of several reed canary grass plants with flowering heads
Phalaris arundinacea
Reed canary grass is native to Europe, Asia, and North America, and it varies quite a bit. Our native Missouri version, for instance, is quite different from the Eurasian type that has been widely introduced—and which has proven to be highly invasive. More

Rough-Fruited Cinquefoil (Sulphur Cinquefoil)

Photo of rough-fruited cinquefoil plant and flowers
Rough-fruited cinquefoil is common in most of North America in fields and pastures, along roadsides, and other disturbed areas. It’s a stout, tall, hairy plant with five yellow to cream-colored, slightly notched petals. More

Rough-Fruited Cinquefoil (Sulphur Cinquefoil)

Photo of rough-fruited cinquefoil flowers
Rough-fruited cinquefoil flowers have 5 slightly notched petals that are longer than the calyx lobes and light yellow to cream-colored. It blooms May-August. More