Tithonia

Tithonia subsp. var.	Mexican sunflower
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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 U.S. 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.

Standard Cyclopedia of Horticulture

Tithonia (of mythological derivation; Tithonus was the favorite of Aurora). Compositae. Robust half-hardy annuals sometimes shrubby at base: lvs. alternate, petioled, entire or 3-lobed: heads large, on a long thickened peduncle, heterogamous; ray-fls. neuter, disk-fls. perfect and fertile; involucre hemispherical or broadly campanulate; receptacle convex; corolla yellow, ray-fls. ligulate, disk-fls. tubular, 5-toothed: achenes somewhat pilose.—About 10 species, Mex., Cent. Amer., and W. Indies. CH The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

Cultivation

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Propagation

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Pests and diseases

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Species

Species include: Species include:

• 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.

Gallery

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References

• Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963

External links

• w:Tithonia. Some of the material on this page may be from Wikipedia, under the Creative Commons license.
• Tithonia QR Code (Size 50, 100, 200, 500)