Chrysanthemums (/krɪˈsænθəməm/), sometimes called mums or chrysanths,[4] are flowering plants of the genus Chrysanthemum in the family Asteraceae. They are native to East Asia and northeastern Europe. Most species originate from East Asia and the center of diversity is in China.[5] Countless horticultural varieties and cultivars exist.
The genus once included more species, but was split several decades ago[when?] into several genera, putting the economically important florist’s chrysanthemums in the genus Dendranthema. The naming of these genera has been contentious, but a ruling of the International Botanical Congress in 1999 changed the defining species of the genus to Chrysanthemum indicum, restoring the florist’s chrysanthemums to the genus Chrysanthemum.
Genera now separated from Chrysanthemum include Argyranthemum, Glebionis, Leucanthemopsis, Leucanthemum, Rhodanthemum, and Tanacetum.
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