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Coreopsideae

Coreopsideae
Cosmos bipinnatus field
Scientific classification Edit this 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]

  1. ^ Cite error: The named reference Uniprot was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Ryding1992 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Kubitzki was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Kimballa2004 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Niehaus1976 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Kellogg1999 was invoked but never defined (see the help page).

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