Field number : WTH 460
Collector : Wolter ten Hoeve
Species : Mammillaria duwei 
Locality : Near the top of the hill at km 1 of the road to Xichú, Guanajuato, Mexicó
Date : 2004
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