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Texas blueweed
Texas blueweed (Helianthus ciliaris)
ODA rating: A
 
Other common names
blueweed and yerba parda
 
Description
Perennial; blooms in mid summer. Grows 1 to 2 feet tall. Stems arise from woody, creeping roots. Leaves mostly opposite, narrow to broadly lance-shaped, margins wavy, often with hairs. Flower heads comprised of yellow outer ray flowers, and reddish to dark purple inner disk flowers.
 
Impacts
This plant is native to the southwestern U.S. and can be found in both cropland and disturbed areas. It is unpalatable to livestock and severely reduces crop yield in some regions. Because of its competitive nature and persistent growth, it poses the threat of becoming the dominant plant in cultivated fields it has invaded.
 

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  Images courtesy of Weed Science Society of America.
 
 
Distribution in Oregon
This species is not yet known to occur in Oregon.
 
Biological controls
Biological control agents are not used on "A" listed weeds in Oregon. If this weed is found in the state it will be managed for eradication or containment.