Cardamine hirsuta L.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Annual with glabrous stems 1–4 dm; basal lvs numerous and conspicuous in comparison with the few small stem-lvs, the pl appearing subscapose; terminal lfl of basal lvs rotund to reniform, entire to shallowly few-lobed; petioles of the cauline lvs ciliate at least at base; lateral segments of the cauline lvs gradually narrower toward the top of the stem, obovate-oblong to linear-spatulate, often with 1 or 2 teeth, commonly hirsutulous above; pet white, 2–3 mm; pedicels narrowly ascending; frs erect, 1.5–2.5 cm; 2n=16. Widely distributed in the Old World; naturalized in moist, especially sandy soil from s. N.Y. to Ill. and Ala. Mar., Apr.