Plants: erect, perennial, 1'-4' tall, spiny forb with deep, colony-forming, creeping roots
Leaves: usually pinnately-divided, more or less whitish below
Flowers: head 1/2" wide with pink disk flowers; inflorescence of many heads in usually flat-topped clusters; blooms June-Oct.
Fruits: dry seed on fluffy, feathery-divided pappus
Habitat: disturbed sites, fields
Invasiveness: Restricted Invasive - Eradicate!
Conservation Status: Introduced - naturalized; ecologically invasive and noxious weed
Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.