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Tagetes patula : ウィキペディア英語版 | Tagetes patula
The French marigold (''Tagetes patula'') is a species in the daisy family (Asteraceae). It is native to Mexico and Guatemala〔(Rydberg, Per Axel 1913. in Britton, Nathaniel Lord, North American Flora 34: 154-155 )〕 with several naturalised populations in many other countries. ==Physical characteristics== The flower is an annual, occasionally reaching 0.5 m by 0.3 m. In some climates it flowers from July to October. In its native habitat of the highlands of central Mexico, blooms are produced from September to killing frost. Achenes ripen and are shed within two weeks of the start of bloom. The heads contain mostly hermaphrodite (having both male and female organs) florets and are pollinated primarily by beetles in the wild, as well as by tachinid flies and other insects. The leaves of all species of marigold include oil glands. The oils are pungent.〔Soule, J. A. 1993. "The Biosystematics of ''Tagetes''" Ph.D. Dissertation, University of Texas〕
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