Coreopsideae

Coreopsideae

Coreopsideae

Tribe of plants

Coreopsideae is a tribe of flowering plants belonging to the Asteroideae subfamily.[1] It includes widely cultivated genera such as Cosmos and Dahlia.

Quick Facts Scientific classification, Genera ...

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]

Genera

The 26 Coreopsideae genera recognized by the Global Compositae Database as of April 2022:[7]

References

  1. [1]
    Asteroideae - Taxonomy
  2. [2]
    Ryding, Olof; Bremer, Kare (1992), "Phylogeny, Distribution, and Classification of the Coreopsideae (Asteraceae)", Systematic Botany, 17 (4): 649–659, doi:10.2307/2419733, JSTOR 2419733
  3. [3]
    Klaus Kubitzki, Joachim W. Kadereit, Charles Jeffrey; The Families and Genera of Vascular Plants
  4. [4]
    Rebecca T. Kimballa, Daniel J. Crawford (2004), "Phylogeny of Coreopsideae (Asteraceae) using ITS sequences suggests lability in reproductive characters", Molecular Phylogenetics and Evolution, 33 (1): 127–139, doi:10.1016/j.ympev.2004.04.022, PMID 15324843
  5. [5]
    Niehaus, Theodore F.; Ripper, Charles L. (1976), Pacific States Wildflowers, New York: Houghton Mifflin, ISBN 0-395-91095-1
  6. [6]
    Kellogg, E.A. (1999). "Phylogenetic aspects of the evolution of C4 photosynthesis". In Sage, R.F.; Monson, R.K. (eds.). C4 plant biology (PDF). San Diego, CA: Academic Press. pp. 411–444. ISBN 0126144400. Retrieved 2018-05-26.
  7. [7]
    "Coreopsideae Lindl". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-04-04.
  8. [8]
    Pruski, J.F.; Tadesse, Mesfin & Crawford, D.J. (2015), "Studies of Neotropical Compositae–XI. The new generic name Electranthera (Coreopsideae)" (PDF), Phytoneuron, 2015–68: 1–17, retrieved 2024-05-13
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