Tithonia
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| Tithonia | |
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| Tithonia diversifolia | |
| Scientific classification | |
| Kingdom: | Plantae |
| (unranked): | Angiosperms |
| (unranked): | Eudicots |
| (unranked): | Asterids |
| Order: | Asterales |
| Family: | Asteraceae |
| Subfamily: | Asteroideae |
| Tribe: | Heliantheae |
| Genus: | Tithonia Desf. ex Juss. |
| Species | |
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See text |
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| Synonyms | |
Tithonia is a genus of flowering plants in the family Asteraceae. It includes 11 species, with a center of distribution in Mexico but with one species extending into the Southwestern United States and several extending into 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.
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[edit] Species
- Tithonia brachypappa B.L.Rob.
- Tithonia calva Sch.Bip.
- Tithonia diversifolia (Hemsl.) A.Gray – Tree Marigold
- Tithonia fruticosa Canby & Rose
- Tithonia hondurensis La Duke
- Tithonia koelzii McVaugh
- Tithonia longiradiata (Bertol.) S.F.Blake
- Tithonia pedunculata Cronquist
- Tithonia rotundifolia (Mill.) S.F.Blake
- Tithonia thurberi Gray – Arizona Sunflower Weed
- Tithonia tubaeformis (Jacq.) Cass.[2][3]
[edit] Formerly placed here
- Enceliopsis argophylla (as T. argophylla)[3]
[edit] References
- ^ "Tithonia Desf. ex Juss.". Germplasm Resources Information Network. United States Department of Agriculture. 1996-09-17. http://www.ars-grin.gov/cgi-bin/npgs/html/genus.pl?12171. Retrieved 2010-06-06.
- ^ "Tithonia". Integrated Taxonomic Information System. http://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=38529. Retrieved 6 June 2010.
- ^ a b "Species Records of Tithonia". Germplasm Resources Information Network. United States Department of Agriculture. http://www.ars-grin.gov/cgi-bin/npgs/html/splist.pl?12171. Retrieved 2010-06-06.
- La Duke, J. C. 1982. Revision of Tithonia. Rhodora 84: 453-522.
[edit] External links
Media related to Tithonia at Wikimedia Commons
Data related to Tithonia at Wikispecies
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