Field number : ML 331
Collector : Michel Lacoste
Species : Mammillaria duwei 
Locality : Mexicó : Guanajuato (2km after the junction to Victoria , San Luis de la Paz - Xichú 2000m)
Date : 22/07/1991
Notes :
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria duwei
New Cactus Lexicon - David Hunt = Mammillaria duwei
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria duwei (H.Rogozinski & P.J.Braun 1985)
http://www.mammillarias.net
Semeurs de cactus