Gleason & Cronquist
Vascular plants of NE US and adjacent Canada
A Eurasian annual with narrower lvs (to 5 mm wide), elongate, linear cal- lobes (8-20 mm) and smaller (10-13 mm) pink-purple fls, rarely escapes.
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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