Invasive Species: Dipsacus fullonum, Common Teasel
Common teasel is an invasive biennial plant that exists as a basal rosette until flower stems develop. The erect flower stems reach 6 ft. (1.8 m) in height and support spiny flower heads …
Chondrilla juncea, Rush Skeletonweed
Invasive Species: Chondrilla juncea, Rush Skeletonweed
Rush skeletonweed is an invasive perennial forb that can grow up to 4 ft. (1.2 m) tall. Coarse-looking, multiple stems appear leafless due to inconspicuous leaves and arise from a basal rosette of …
Centaurea nigra, Black Knapweed
Invasive Species: Centaurea nigra, Black Knapweed
Black knapweed is an invasive perennial plant that can grow from 1 to 3 ft. (0.3 to 0.9 m) tall. Leaves, near the base, are petiolate, oblanceolate, shallowly dentate, and 2 to 10 …
Centaurea jacea, Brown Knapweed
Invasive Species: Centaurea jacea, Brown Knapweed
Brown knapweed is an invasive perennial plant that grows 1 to 3 ft (0.3 to 0.9 m) tall and invades dry fields, roadsides, and meadows. The basal leaves are oblanceolate to elliptic and …
Hieracium caespitosum, Meadow Hawkweed
Invasive Species: Hieracium caespitosum, Meadow Hawkweed
Meadow hawkweed is an invasive perennial plant in the sunflower family (Asteraceae). It grows from 1 to 3 ft. (0.3 to 0.9 m) tall and produces a milky sap when crushed. Leaves are …
Hieracium aurantiacum, Orange Hawkweed
Invasive Species: Hieracium aurantiacum, Orange Hawkweed
Orange hawkweed is an invasive perennial plant that can grow up to 11.8 to 23.6 in. (30 to 60 cm) tall and produces a milky sap. Leaves are mostly basal, elliptical, 2 to …
Dipsacus laciniatus, Cutleaf Teasel
Invasive Species: Dipsacus laciniatus, Cutleaf Teasel
Cutleaf teasel is an invasive perennial plant that grows as a basal rosette until sending up a flowering stalk that can reach 6 to 7 ft. (1.8 to 2.1 m) in height. The …
Ranunculus ficaria, Fig Buttercup
Invasive Species: Ranunculus ficaria, Fig Buttercup
Fig buttercup is a short (up to 12 in. [30.5 cm]), herbaceous perennial that invades forests throughout the East, Midwest and Pacific Northwest regions of the United States. The basal leaves are dark …
Polygonum caespitosum, Oriental Ladysthumb
Invasive Species: Polygonum caespitosum, Oriental Ladysthumb
Oriental ladysthumb is an invasive annual forb that can reach 6 to 30 in. (15.2 to 76.2 cm) in height and can be either erect or sprawling. Leaves are elongate, narrow, and pointed …
Lactuca serriola, Prickly Lettuce
Invasive Species: Lactuca serriola, Prickly Lettuce
Prickly lettuce is an invasive annual or biennial that can reach heights of 6 ft. (1.8m). Cauline leaves (on the stem) are alternate, 2 to 14 in. (5 to 36 cm) long; they …