Tithonia

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Tithonia
Tithonia diversifolia.JPG
Tithonia diversifolia
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Asterales
Family: Asteraceae
Subfamily: Asteroideae
Tribe: Heliantheae[1]
Genus: Tithonia
Desf. ex Juss. 1789 not Kuntze 1891 (Phytolaccaceae)[2]
Synonyms[1][3]

Tithonia is a genus of flowering plants in the sunflower tribe within the Asteraceae family.[4][5]

Tithonia has a center of distribution in Mexico but with one species extending into the Southwestern United States and several native to Central America. Two species, T. diversifolia and T. rotundifolia, are widely cultivated and have escaped to become weeds in tropical and subtropical areas around the world. The distinguishing feature of the genus is the peduncle, which is fistulose (meaning hollow and flaring toward the apex). The plants are coarse annual or perennial herbs or shrubs, and one species, T. koelzii, is a small tree.[6]

Species[1][7][8]
  1. Tithonia brachypappa B.L.Rob. - San Luis Potosí
  2. Tithonia calva Sch.Bip. - Durango, Sinaloa
  3. Tithonia diversifolia (Hemsl.) A.Gray – Tree Marigold - Mexico, Central America; naturalized in Asia, Australia, Africa, South America, Florida, Texas, various oceanic islands
  4. Tithonia fruticosa Canby & Rose - Chihuahua, Durango, Sonora, Sinaloa
  5. Tithonia helianthoides Bernh.
  6. Tithonia hondurensis La Duke - Belize, Honduras
  7. Tithonia koelzii McVaugh - Jalisco
  8. Tithonia longiradiata (Bertol.) S.F.Blake - Mexico, Central America
  9. Tithonia pedunculata Cronquist - Oaxaca
  10. Tithonia pittieri (Greenm.) S.F.Blake - Central America
  11. Tithonia rotundifolia (Mill.) S.F.Blake - Mexico, Central America; naturalized in Florida, Louisiana, South America
  12. Tithonia tagetiflora Desf. - Veracruz
  13. Tithonia thurberi Gray – Arizona Sunflower Weed - Chihuahua, Sonora, Arizona (Pima County)
  14. Tithonia tubiformis (Jacq.) Cass. - Mexico, Central America; naturalized in Argentina
formerly included[1]

see Comaclinium Enceliopsis Lasianthaea Viguiera

Mexican Sunflower
Tithonia rotundifolia

References[edit]

  1. ^ a b c d Flann, C (ed) 2009+ Global Compositae Checklist
  2. ^ Tropicos, search for Tithonia
  3. ^ "Tithonia Desf. ex Juss.". Germplasm Resources Information Network. United States Department of Agriculture. 1996-09-17. Retrieved 2010-06-06. 
  4. ^ Jussieu, Antoine Laurent de. 1789. Genera Plantarum 189 in Latin
  5. ^ Tropicos, Tithonia Desf. ex Juss.
  6. ^ Flora of North America, Vol. 21 Page 138, Sunflowerweed, Tithonia Desfontaines ex Jussieu, Gen. Pl. 189. 1789.
  7. ^ "Tithonia". Integrated Taxonomic Information System. Retrieved 6 June 2010. 
  8. ^ "Species Records of Tithonia". Germplasm Resources Information Network. United States Department of Agriculture. Retrieved 2010-06-06. 
  • La Duke, J. C. 1982. Revision of Tithonia. Rhodora 84: 453-522.

External links[edit]

Media related to Tithonia at Wikimedia Commons Data related to Tithonia at Wikispecies