| Coreopsideae | |
|---|---|
 | |
| Cosmos bipinnatus field | |
Scientific classification  | |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Eudicots |
| Clade: | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Coreopsideae (Less.) Lindl. |
| Genera | |
See text | |
Coreopsideae is a tribe of flowering plants belonging to the Asteroideae subfamily. [1] It includes widely cultivated genera such as Coreopsis, after which the tribe is named, as well as Cosmos and Dahlia .
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A similar group has been recognized since 1829, generally as part of the tribe Heliantheae (Cassini, 1819). [2] In the late 20th century, molecular studies caused a slightly redefined version of this group to be recognized as its own tribe, Coreopsideae. [2] The larger version of Heliantheae was split into tribes including Bahieae, Chaenactideae, Coreopsideae, Helenieae and, finally, Heliantheae (sensu stricto). [3] Within the tribe, the traditional definition of genera based on flower and fruit characters does not reflect evolutionary relationships as inferred through molecular phylogenetics. [4]
The tribe is characterized by shiny green bracts at the base of the flower head in two rows: an inner row of tightly spaced bracts and an outer row of a smaller number pointing downward. [5] It includes five genera that use C4 carbon fixation: Chrysanthellum , Eryngiophyllum , Glossocardia (including Guerreroia), Isostigma , and Neuractis . These genera are thought to share a common ancestor and thus a single origin of C4 carbon fixation. [6]
