下面的资料应该是比较新的: Chrysanthemums are a genus (Chrysanthemum) of about 30 species of perennialflowering plants in the family Asteraceae, native to Asia and northeastern Europe.
Taxonomy
The genus once included many more species, but was split several decades ago into several genera; the naming of the genera has been contentious, but a ruling of the International Code of Botanical Nomenclature in 1999 resulted in the defining species of the genus being changed to Chrysanthemum indicum, thereby restoring the economically important florist\'s chrysanthemum to the genus Chrysanthemum. These species were, after the splitting of the genus but before the ICBN ruling, commonly treated under the genus name Dendranthema.