Field number : WCO 25
Collector : Wolfgang Colotti
Species : Mammillaria duwei 
Locality : 20km East of San Luis de la Paz, crossing to Xichu, Guanajuato, Mexicó
Date : 27/05/09
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