Plumeless thistle (Carduus acanthoides)

Plumeless thistle (Carduus acanthoides)
Images courtesy Dan Sharratt
Plumeless thistle (Carduus acanthoides)
Plumeless thistle (Carduus acanthoides)
EDRR Species?: 
Yes

Description
Winter annual or biennial herb, flowers May to July. Grows 1 to 4 feet tall. Stems are covered with spiny wings. Rosette leaves are 4 to 8 inches long; stem leaves alternate and blend into the stem. Flower heads are in clusters of 2 to 5 and are usually purple, but can be yellow or white.

Impacts
Each plant generates thousands of seeds. It is very aggresive, limiting grazing and other livestock management, threatening forage production, and restricting recreational activities. Plumeless thistle invades pastures, valleys, fields, roadsides and open native habitats.