Erigeron strigosus Muhl.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Species Description - Annual or rarely biennial, 3-7(-12) dm, sparsely leafy, ± hairy, the hairs spreading or usually mostly appressed; basal lvs mostly oblanceolate to elliptic, entire or toothed, not over 15 cm (petiole included) × 2.5 cm; cauline lvs linear to lanceolate, mostly entire; heads several to very many; invol 2-5 mm, obscurely glandular and ± hairy; disk 5-12 mm wide; rays 50-100, white, or occasionally pinkish or bluish, to 6 mm, 0.4-1.0 mm wide, or much reduced; disk-cors 1.5-2.5 mm; pappus as in no. 7 [Erigeron annuus (L.) Pers.]; 2n=18, 27, 36, 54. A weed in disturbed sites over most of the U.S. and s. Can. (E. ramosus) Four vars.