Heliantheae

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File:Bidens biternata W IMG 2942.jpg
Bidens biternata- Spanish needles

The Heliantheae (sometimes called the sunflower tribe) are the third-largest tribe in the sunflower family (Asteraceae). With some 190 genera and nearly 2500 recognized species, only the tribes Senecioneae and Astereae are larger. The name is derived from the genus Helianthus, which is Greek for sun flower. Most genera and species are found in North America (particularly in Mexico) and South America. A few genera are pantropical.

Most Heliantheae are herbs or shrubs, but some grow to the size of small trees. Leaves are usually hairy and arranged in opposite pairs. The anthers are usually blackened.

The above statements about the size and distribution of the tribe apply to a broad definition of Heliantheae, which was followed throughout the 20th century. Some recent authors break the tribe up into a dozen or so smaller tribes.[citation needed]

Uses

Commercially important plants in the Heliantheae include sunflower and Jerusalem artichoke. Many garden flowers are also in this group, such as Coreopsis, Cosmos, Echinacea, Rudbeckia, and Zinnia. Some authors separate Coreopsis and Cosmos into the Coreopsideae tribe.[1]

In contrast to the benefits brought by the group, some are problematic weeds. Species of Ambrosia (ragweed) produce large quantities of highly allergenic pollen. Each plant is reputed to be able to produce about a billion grains of pollen over a season, and the plant is wind-pollinated.

Taxonomy

The traditional circumscription of the Heliantheae arises from Cassini's 19th-century classification of the Asteraceae. This broad group been divided by some authors into smaller tribes: Bahieae, Chaenactideae, Coreopsideae, Helenieae, Heliantheae sensu stricto, Madieae, Millerieae, Perityleae, Polymnieae, and Tageteae. Because the Eupatorieae originated from within the Heliantheae (broadly defined), to maintain monophyletic taxa it is necessary to either make Eupatorieae a subtribe within Heliantheae or to split the Heliantheae into smaller tribes.[2][3] Such classifications may define a supertribe Helianthodae including these smaller tribes, the Eupatorieae, and a few other tribes such as Inuleae.[4]

Subtribes and genera

Heliantheae subtribes and genera recognized by the Global Compositae Database as of May 2022:

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References

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  1. ^ Page Module:Citation/CS1/styles.css has no content.Judd, Walter S.; Campbell, Christopher S.; Kellogg, Elizabeth A.; Stevens, Peter F.; Donoghue, Michael J. (2016). Plant Systematics, A phylogenetic approach. U.S.A.: Sinauer Associates, Inc. pp. 541–547. ISBN 978-1-60535-389-0.
  2. ^ Page Module:Citation/CS1/styles.css has no content."187n. Asteraceae tribe Eupatorieae". Flora of North America (Vol. 21 Page 456, 459). Retrieved 2007-10-06.
  3. ^ Page Module:Citation/CS1/styles.css has no content."187. Asteraceae". Flora of North America. Retrieved 2007-12-07.
  4. ^ Helianthodae H. Rob. Script error: No such module "webarchive"., Tree of Life Web Project
  5. ^ Page Module:Citation/CS1/styles.css has no content."Ambrosiinae Less". Global Compositae Database. Compositae Working Group (CWG). Archived from the original on 2022-07-02. Retrieved 2022-05-16.
  6. ^ Page Module:Citation/CS1/styles.css has no content."Chromolepidinae Panero". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  7. ^ Page Module:Citation/CS1/styles.css has no content."Dugesiinae Panero". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  8. ^ Page Module:Citation/CS1/styles.css has no content."Ecliptinae Less". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  9. ^ Page Module:Citation/CS1/styles.css has no content."Enceliinae Panero". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  10. ^ Page Module:Citation/CS1/styles.css has no content."Engelmanniinae Stuessy". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  11. ^ Page Module:Citation/CS1/styles.css has no content."Helianthinae Dumort". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  12. ^ Page Module:Citation/CS1/styles.css has no content."Montanoinae H.Rob". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  13. ^ Page Module:Citation/CS1/styles.css has no content."Rojasianthinae Panero". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  14. ^ Page Module:Citation/CS1/styles.css has no content."Rudbeckiinae H.Rob". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  15. ^ Page Module:Citation/CS1/styles.css has no content."Spilanthinae Panero". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  16. ^ Page Module:Citation/CS1/styles.css has no content."Verbesininae Benth. & Hook.f." Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  17. ^ Page Module:Citation/CS1/styles.css has no content."Zaluzaniinae H.Rob". Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.
  18. ^ Page Module:Citation/CS1/styles.css has no content."Zinniinae Benth. & Hook.f." Global Compositae Database. Compositae Working Group (CWG). Retrieved 2022-05-16.

Bibliography

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