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Noxious Weed!Yellowspine Thistle (Cirsium ochrocentrum)
Sunflower Family (Asteraceae)

 


California Department of Food and Agriculture

 
 
 
 

Description:Biennial or perennial with tubrous creeping roots. Stems to 2-1/2 feet, simple or branched, with dense, short, white wooly hairs. Plant somewhat bushy. Leaves narrowly divided, green to gray, 3 to 8 inches long with tufts of soft wooly hairs on upper surface, densely wooly pubescent on lower surface. Leaf margins irregularly toothed with yellowish spines 1/8 to 1/4 inch long. Flowers solitary or few clustered, terminal, rose to cream colored. Phyllaries covered with cobweb-like hairs, with dark glandular ridge and spreading yellow spine-tip. Seeds light brown, smooth, with tuft of hairs at tip.
Habitat:Native to the central United States. Invades disturbed areas, rangelands, and pastures.

Distribution: There are only two known sites of yellowspine thistle in northern California. One is found east of Alturas, and the other along Fandango Pass Road (Modoc County).

Flowering Period: June to October.

 


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