A Eurasian sp. with the upper (sometimes also the median) lvs pinnatifid, usually ochroleucous fls, and strongly hirsute herbage, has been found as a waif in Pa. and D.C.

Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.

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