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yellow hawkweed (hieracium floribundum)
NOT KNOWN TO OCCUR IN OREGON PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES

USDA Symbol: HIFL3

ODA rating: A and T
yellow hawkweed risk assessment
Noxious weed listing process

 
Click photo to view larger image.
 
Image courtesy of G. Russ.
 
 
 
If images are downloaded and used from the ODA web site please be sure to credit the photographer. 
 
Description
Perennial; flowers June to July in lower elevations. Grows 10 to 36 inches tall. Leaves hairy, spatula shaped and almost exclusively basal. Flower heads clustered, yellow, 1/2 wide, and number up to 30 per plant. Extensive stolons form dense mats of vegetation. King-devil hawkweed (H. piloselloides), yellow hawkweed (H. floribundum) and meadow hawkweed (H. pratense) are all very similar and difficult to classify. Native hawkweeds have numerous stem leaves, lack stolons and generally have solitary flowers.

Impacts
These plants produce mats of rosettes that prevent other plants from establishing seedlings. They grow in grassy areas and do not tolerate shade well. They are becoming troublesome weeds in native meadows, prairies, pastures and lawns.

Distribution in Oregon
This plant is not known to occur in Oregon at this time.

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:
Oregon WeedMapper
Printable yellow hawkweed trifold brochure (pdf)