Field number : pm 82
Collector : Ken Preston-Mafham
Species : Mammillaria heyderi v. macdougalii 
Locality : Tombstone, Arizona, USA
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria heyderi subsp. macdougalii
New Cactus Lexicon - David Hunt = Mammillaria heyderi subsp. macdougalii
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria heyderi (Muehlenpf. 1848)
http://www.mammillarias.net
Semeurs de cactus
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