| Summary: | Additional information is presented on the distribution of various exotic species of Brassicaceae, introduced recently to central Mexico. Three populations of Thlaspi arvense L. and Sinapis alba L. are reported. The species Diplotaxis muralis (L.) DC., Hirschfeldia incana (L.) Lagrèze-Fossat and Brassica tournefortii Gouan, known previously from northern Mexico, are now naturalized at various localities in the central part of the country. Rapistrum rugosum (L.) All., Cardamine hirsuta L., Lepidium latifolium L. and Lepidium draba L. (= Cardaria draba (L.) Desv.) are expanding in the Valley of Mexico and some neighboring regions.
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