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Tithonia : ウィキペディア英語版
Tithonia

''Tithonia'' is a genus of flowering plants in the sunflower tribe within the Asteraceae family.〔(Jussieu, Antoine Laurent de. 1789. Genera Plantarum 189 ) in Latin〕〔(Tropicos, ''Tithonia'' Desf. ex Juss. )〕
''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.〔(Flora of North America, Vol. 21 Page 138, Sunflowerweed, ''Tithonia'' Desfontaines ex Jussieu, Gen. Pl. 189. 1789. )〕
;Species〔(Flann, C (ed) 2009+ Global Compositae Checklist )〕
# ''Tithonia brachypappa'' B.L.Rob. - San Luis Potosí
# ''Tithonia calva'' Sch.Bip. - Durango, Sinaloa
# ''Tithonia diversifolia'' (Hemsl.) A.Gray – Tree Marigold - Mexico, Central America; naturalized in Asia, Australia, Africa, South America, Florida, Texas, various oceanic islands
# ''Tithonia fruticosa'' Canby & Rose - Chihuahua, Durango, Sonora, Sinaloa
# ''Tithonia helianthoides'' Bernh.
# ''Tithonia hondurensis'' La Duke - Belize, Honduras
# ''Tithonia koelzii'' McVaugh - Jalisco
# ''Tithonia longiradiata'' (Bertol.) S.F.Blake - Mexico, Central America
# ''Tithonia pedunculata'' Cronquist - Oaxaca
# ''Tithonia pittieri'' (Greenm.) S.F.Blake - Central America
# ''Tithonia rotundifolia'' (Mill.) S.F.Blake - Mexico, Central America; naturalized in Florida, Louisiana, South America
# ''Tithonia tagetiflora'' Desf. - Veracruz
# ''Tithonia thurberi'' Gray – Arizona Sunflower Weed - Chihuahua, Sonora, Arizona (Pima County)
# ''Tithonia tubiformis'' (Jacq.) Cass. - Mexico, Central America; naturalized in Argentina
;formerly included〔
see ''Comaclinium Enceliopsis Lasianthaea Viguiera''
==References==

*La Duke, J. C. 1982. Revision of ''Tithonia''. Rhodora 84: 453-522.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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