Purple Starthistle

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	Centaurea calcitrapa
	Family Name:	Asteraceae
	Class:	A
	Other Names:
	Why is it a noxious weed?	Similar to yellow starthistle, this is an aggressive Centaurea, which is a major problem on annual rangelands in the San Francisco Bay area.

More Information:

Visit Washington State Noxious Weed Control Board Here