Content tagged with "weed"

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

Rough-Fruited Cinquefoil (Sulphur Cinquefoil)

Photo of rough-fruited cinquefoil plant with flowers
Rough-fruited cinquefoil is a native of Europe that was introduced widely in the United States. It grows in fields, pastures, waste grounds, rights-of-way, and other disturbed areas. You might also find it in prairies, bases and tops of bluffs, glades, and banks of streams. More

Rough-Fruited Cinquefoil (Sulphur Cinquefoil)

Photo of yellow rough-fruited cinquefoil flower
Within any species there is always some natural variation among individuals. Rough-fruited cinquefoil is often seen in its rather pale-flowered form, but sometimes the petals are slightly deeper yellow. This is one reason why it’s good to use several characters when making an identification. More

Rough-Fruited Cinquefoil (Sulphur Cinquefoil) (Leaf)

Photo of rough-fruited cinquefoil leaf
The leaves of rough-fruited cinquefoil are 5- to 7-divided, with ovate, toothed leaflets that appear fingerlike. The basal leaves are on long stalks; the stem leaves are on shorter stalks or stalkless. More

Sericea Lespedeza

Photo of large group of sericea lespedeza plants
Decades ago, sericea lespedeza was introduced in hopes it would provide hay, improve pastures, stop soil erosion, and supply food and cover for wildlife. Unfortunately, it has proven to be an aggressive, invasive weed that is extremely difficult to control, escapes cultivation, and outcompetes native plants. More

Sericea Lespedeza

Photo of large group of sericea lespedeza plants
Lespedeza cuneata
Decades ago, sericea lespedeza was introduced in hopes it would provide hay, improve pastures, stop soil erosion, and supply food and cover for wildlife. Unfortunately, it has proven to be an aggressive, invasive weed that is extremely difficult to control, escapes cultivation, and outcompetes native plants. More

Shepherd’s Purse

Photo of shepherd’s purse plant and flowers
Capsella bursa-pastoris
How many countries have you been to? 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 weed. More

Spotted Knapweed

Photo of spotted knapweed flower head showing spots on involucral bracts
Centaurea stoebe
Spotted knapweed is an invasive plant that outcompetes native communities, takes over pastureland, and even beats back invasive sericea lespedeza! It has arrived in our state. Let’s prevent its spread. More

Spotted Knapweed (Flower)

Photo of spotted knapweed flower head showing spots on involucral bracts
The black, arrow-shaped spot on each bract gives spotted knapweed its common name. More

Spotted Knapweed (Leaves)

Photo of spotted knapweed plant showing foliage and growth habit
A single spotted knapweed plant can have a single stem or as many as 20 stems. It usually flowers in the second year, producing branched stems. The leaves are alternate, deeply lobed, and pale blue-gray. More