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.
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.
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