Monographs Details: Cotula
Authority: Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.
Description:Genus Description - Heads disciform, the outer 1–several series of fls pistillate, with short tubular cor, or rarely all the fls perfect; invol bracts slightly unequal, ca 2-seriate, membranous or subherbaceous, commonly with narrow scarious margins; receptacle naked, flat to conic; disk-fls usually fertile, with 4-toothed yellow cor; style-branches flattened, truncate, penicillate; achenes, especially of the outer fls, ± stipitate, compressed parallel to the invol bracts, commonly minutely striate, otherwise 2–4-nerved or nerveless; pappus a short crown or none; annual or occasionally perennial herbs with alternate, entire to more often pinnatifid or pinnately dissected lvs and small or medium-sized heads. 50, mainly S. Hemisphere.