Flaveria campestris J.R.Johnst.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Rather coarse annual 3–9 dm, glabrous, or sometimes slightly villous at the nodes; lvs lanceolate, sessile, remotely serrulate, 3–7 cm × 6–20 mm; heads cylindric, in glomerules subtended by leafy bracts; invol bracts 3, 5–7 mm, with 2 much smaller calyculate ones at base; rays solitary, 2 mm; disk-fls 3–4; receptacle naked; pappus none. Low ground; Colo. and Kans. to Mex., and intr. in Mo. Aug.–Oct.