Field number : RH 0039
Collector : Ralf Hillmann
Species : Mammillaria pottsii 
Locality : USA : (Texas Brewster Co. Big Bend)
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria pottsii
New Cactus Lexicon - David Hunt = Mammillaria pottsii
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria pottsii (Scheer ex Salm-Dyck 1850)
http://www.mammillarias.net
Semeurs de cactus