Field number : RH 0058
Collector : Ralf Hillmann
Species : Mammillaria tetrancistra 
Locality : USA : (Arizona Coconino Co. Grand Canyon N.P. 1800 m)
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria tetrancistra
New Cactus Lexicon - David Hunt = Mammillaria tetrancistra
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria tetrancistra (Engelm. 1852)
http://www.mammillarias.net
Semeurs de cactus