Field number : CH 361
Collector : Jaromír Chvastek
Species : Mammillaria duwei 
Locality : San Luis Potosi to Guanajuato, Route 57, Guanajuato, Mexicó 1990m
Date : 22/10/1990
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