Tithonia
Tithonia > |
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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.
Read about Tithonia in the Standard Cyclopedia of Horticulture
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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
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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.
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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)