Erysimum cheiranthoides L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Erect, often simple annual 2–10 dm; lvs linear to oblanceolate, entire or barely sinuate; sep 2–3.5 mm; pet bright yellow, 3.5–5.5 mm; mature racemes elongate, with straight rachis and slender, widely divergent pedicels (6–)8–12(–14) mm; frs ascending to erect, (1.2–)1.5–2.5(–3) cm; 2n=16. Usually in wet soil, but also a weed in fields and roadsides; originally European, but now circumboreal, s. in Amer. to N.C., Ark., Colo., and Oreg. June– Aug. (Cheirinia c.)