Field number : RS 133
Collector : Roman Staník
Species : Coryphantha difficilis ? 
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Taxonomy of the Cactaceae - Joël Lodé = Coryphantha difficilis
New Cactus Lexicon - David Hunt = Coryphantha difficilis
The International Plant Names Index : https://www.ipni.org
Coryphantha ((Engelmann) Lemaire 1868)
Coryphantha difficilis ((Quehl) Orcutt 1926)
Semeurs de cactus
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