Field number : IDD 1156
Collector : Igor D. Dráb
Species : Coryphantha difficilis 
Locality : Mexicó : Coahuila (Cerro Bola) * Geocode
Date : 14/11/2008
Notes :
idd21/08 GPS 28, za zbúraniskom vpravo od cesty, spolu s Mammillaria chica. M. grusonii, Opuntia imbricata, Epithelantha micromeris var. gregii, Hamatocactus hamatacanthus a Coryphantha valida
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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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