Chelidonium majus L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Branched, 3–8 dm; cauline lvs several, alternate, much like those of Stylophorum diphyllum; sep glabrous; pet 1 cm; fr 3–5 cm; 2n=12. Eurasian sp., well established in moist soil from Que. to Io., s. to Ga. and Mo. Apr.–Sept.