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Dioon tomasellii : ウィキペディア英語版 | Dioon tomasellii
''Dioon tomasellii'' is a species of cycad in the family Zamiaceae. It is endemic to Mexico, where it occurs in the states of Durango, Guerrero, Jalisco, Michoacán, and Nayarit.〔Vovides, A. & Chemnick, J. 2010. (''Dioon tomasellii''. ) The IUCN Red List of Threatened Species. Version 2015.2. Downloaded on 06 September 2015.〕 This plant grows in oak and pine-oak forest and woodland habitat. Threats to the species include destruction of the habitat for agriculture and overcollection for horticultural purposes.〔 This species was first described in 1984.〔De Luca, P., Sabato, S., & Torres, M. V. (1984). (''Dion tomasellii'' (Zamiaceae), a new species with two varieties from western Mexico. ) ''Brittonia'', 36(3), 223-227.〕 It was revised in 1997, with one variety being elevated to species status as ''Dioon sonorense''.〔Chemnick, J., Gregory, T. J., & Salas Morales, S. (1997). (A revision of ''Dioon tomasellii'' (Zamiaceae) from western Mexico, a range extension of ''D. merolae'', and clarification of ''D. purpusii''. ) ''Phytologia'', 83(1), 1-6.〕 ==References==
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