mouse-ear hawkweed (Hieracium pilosella)
ODA rating: A
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.
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Image courtesy of Dan Tenaglia
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If images are downloaded from the ODA web site please be sure to credit the photographer.
Introduction
This plant is a native of Eurasia but is not known to occur in Oregon at this time.
Distribution in Oregon
Map legend
Yellow: limited distribution in county
Red: abundant in county
Grey: not known to be present in county
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.
Informational Links
WeedMapper
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