Rhizomatous perennial 2-8 dm, simple or nearly so, glabrous or inconspicuously hairy; basal lvs oblanceolate or spatulate, 4-15 cm (petiole included), crenate and often also ±lobed or cleft, the cauline reduced and becoming sessile, deeply and distantly blunt-toothed or sometimes more closely toothed or subentire; heads solitary at the ends of the branches, naked-pedunculate, the disk 1-2 cm wide; rays 15-35, white, 1-2 cm; achenes terete, ca 10- ribbed; x=9; typically diploid, sometimes polyploid. Fields, roadsides, and waste places; native of Eurasia, naturalized throughout most of temp. N. Amer. May-Oct. (Leucanthemum l.; L. vulgare)
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.