Taxonomy
The genus once included more species, but was split several decades ago into several genera, putting the economically important florist's chrysanthemum in the genus Dendranthema. The naming of the genera has been contentious, but a ruling of the International Code of Botanical Nomenclature in 1999 changed the defining species of the genus to Chrysanthemum indicum, restoring the florist's chrysanthemum to the genus Chrysanthemum.
The other species previously included in the narrow view of the genus Chrysanthemum are now transferred to the genus Glebionis. The other genera separate from Chrysanthemum include Argyranthemum, Leucanthemopsis, Leucanthemum, Rhodanthemum, and Tanacetum.
Chrysanthemum species are herbaceous perennial plants growing to 50–150 cm tall, with deeply lobed leaves with large flower heads that are generally white, yellow or pink in the wild. They are the preferred diet of larvae of certain lepidopterans.
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