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., 1829 |
Genera | |
See text |
Coreopsideae is a tribe of flowering plants belonging to the Asteroideae subfamily. [1] It includes widely cultivated genera such as Cosmos and Dahlia.
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]
The 26 Coreopsideae genera recognized by the Global Compositae Database as of April 2022: [7]
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., 1829 |
Genera | |
See text |
Coreopsideae is a tribe of flowering plants belonging to the Asteroideae subfamily. [1] It includes widely cultivated genera such as Cosmos and Dahlia.
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]
The 26 Coreopsideae genera recognized by the Global Compositae Database as of April 2022: [7]