Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
A Eurasian sp. with pinnatifid lvs and with short bracts broadly scarious-margined at base, has been repeatedly introduced in ballast without becoming established.
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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