Field number : L 696
Collector : Alfred Bernhard Lau
Species : Mammillaria mercadensis 
Locality : Mexicó : Durango (Cerro del Mercado 1800-2200m) * Geocode
Date : 24/05/1974
Notes :
together with Myrtillocactus geometrizans
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria mercadensis
New Cactus Lexicon - David Hunt = Mammillaria mercadensis
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria mercadensis (Patoni 1910)
http://www.mammillarias.net
Semeurs de cactus
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