Russian Knapweed


	Rhaponticum repens
	Family Name:	Asteraceae
	Class:	B
	Other Names:	hardheads, Turkestan thistle
	Why is it a noxious weed?	It is an aggressive invader of pastures, non-crop areas, grain fields and other cultivated fields. In addition, the plant is poisonous to horses, causing chewing disease (equine nigropallidal encephalomalacia). Livestock may avoid this species.

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