This is an occasional weed across northeastern states, especially along roadsides and similar sites, often in nurseries and greenhouses. In Ky., the first records date from 1970-90 (M). Though not closely related (2n = 22), it can be confused with the native carolinianum, and further checking is desirable in herbaria. It has upper leaves with more linear, acute segments; flowers deep red-violet/maroon (versus pink); carpel bodies short-hispid with spreading hairs (versus long-villous with ascending hairs); and carpel beaks densely glandular (versus with few or no glands).