Chrysanthemum L.
Annual herbs. Lvs simple, entire to 1-3-pinnatisect, alternate. Capitula few in corymbs, or often solitary, terminal, pedunculate; involucral bracts in 2-4 rows, with membranous margins. Receptacle convex; scales 0. Outer florets ♀, ligulate, yellow, cream, or white, sometimes reddish toward base; inner florets ⚥, tubular and 2-winged. Achenes dimorphic: those of ray florets 2-3-angled with angles often winged; those of disc florets terete in section or somewhat angled, ribbed, sometimes with inner and outer ribs slightly winged, sometimes with small glandular hairs; pappus 0.
Key
3 spp., Europe, N. Africa, Caucasia, Iran, Syria. Naturalised spp. 2.
Recent European Floras and systematic treatments of Anthemideae treat the Chrysanthemum complex as 5 principal genera, all of which have at times been included within Chrysanthemum sens. lat. : Argyranthemum, Chrysanthemum, Leucanthemum, Tanacetum, and Dendranthema (Heywood and Humphries, op. cit.). This narrower circumscription of genera is followed here.
