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mouse-ear hawkweed (hieracium pilosella)
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USDA Symbol: HIPI

ODA rating: A

mouse ear hawkweed risk assessment
Noxious weed listing process
 

Distribution
Oregon mouse-ear hawkweed distribution
 
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Images courtesy of Ed Alverson, TNC.

 
If images are downloaded from the ODA web site please be sure to credit the photographer.
 
Description
Mouse-ear hawkweed is a perennial weed that has leaves with distinctive white midveins and that are covered with long white hairs. It has stolons like strawberries and a fibrous root system. Flowers are produced on a long, leafless stalk and are covered with stiff dark hairs. Flowers occur in clusters of at least two on the top of the flower stalks and are bright yellow in color. Flowers resemble those of a dandelion.
 
Impacts
This plant produces mats of rosettes that prevent other plants from establishing. It displaces native vegetation and decrease biological diversity. It displaces desirable pasture species. It is very tolerant of low soil fertility and over-grazing.  It grows in grassy areas and does not tolerate shade. It is becoming a troublesome weed in native meadows, prairies, pastures and lawns.

Distribution in Oregon
For a collection of spatial information on the distribution of this plant in Oregon go to Oregon WeedMapper

 
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.