Fls all ligulate and perfect, yellow, 7-15 per head; invol cylindric, calyculate; achenes multinerved, glabrous, muricate above, and with a beak that is expanded at the top into a pappiferous disk; pappus of numerous capillary bristles, generally white; lactiferous, branching, often rush-like herbs with well-developed, usually pinnatifid basal lvs and reduced, mostly scattered and entire cauline lvs. 25, temp. Eurasia.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.