Field number : WK 71
Collector : Wolfgang Krueger
Species : Mammillaria sheldonii 
Locality : Mexicó : Sonora (Alamos) * Geocode
Date : 1988
Notes :
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Taxonomy of the Cactaceae - Joël Lodé = Mammillaria sheldonii
New Cactus Lexicon - David Hunt = Mammillaria grahamii subsp. sheldonii
The International Plant Names Index : https://www.ipni.org
Mammillaria (Haworth 1812)
Mammillaria sheldonii ((Britton & Rose) Boedeker 1933)
http://www.mammillarias.net
Semeurs de cactus
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