Field number : LAU 640
Collector : Alfred Bernhard Lau
Species : Mammillaria guelzowiana 
Locality : Mexicó : Duirango (San Francisco de Asis 1200m) * Geocode
Date : 20/02/1974
Notes :
together with Coryphantha longicornis, Thelocactus heterochromus, Echinofossulocactus multicostatus, Echinocereus durangensis
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria guelzowiana
New Cactus Lexicon - David Hunt = Mammillaria guelzowiana
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria guelzowiana (Werderm. 1928)
http://www.mammillarias.net
Semeurs de cactus
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