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Species
Information
- woolly
distaff thistle
- Carthamus
lanatus L.
- USDA
Symbol: CALA20
- Oregon
Noxious Weed Designation: A,T
- Pictures
ALERT: PLEASE CALL 1-866-INVADER IF YOU SUSPECT YOU HAVE FOUND THIS SPECIES IN OREGON
Identification:
Annual; flowers July through August. Grows, up to 3 1/2’ tall. Alternate leaves, with long, stout marginal and terminal spines on the leaves. Flowers yellow in spiny heads. Very similar to smooth distaff thistle, except it has a longer pappas, is more densely covered in hairs, and seedling leaves are less deeply lobed.
Impacts: Carthamus sp. are believed to be the most serious threat to range and pasture lands in Oregon. Dense stands can crowd out other vegetation, livestock and recreational access. Dead plants remain standing, thorned and rigid for at least one year after dieing back. Iit is not grazed as it is not palatable to domestic animals or wildlife. Once established, it is difficult to eliminate because of a persistant seedbank.
Biological
Controls: Biological control agents are not used on "A" listed weeds in Oregon. This weed is being managed for eradication or containment.
Oregon
Maps of Woolly Distaff Thistle Distribution
Links:
USDA
Plants Database information on woolly distaff thistle
GRIN
Database information on woolly distaff thistle
Oregon Department
of Agriculture information on woolly distaff thistle
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