Cactus and Succulent Field Number

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Field number : SH 736
Collector : Dennis Sargant (plants collected by Alfred Bernhard Lau)
Species : Coryphantha difficilis   cactuspro.com
Locality : Mexicó : Coahuila (General Cepeda 1400m)      * Geocode
Date : 21/11/1974
Notes :
together with Mammillaria hemisphaerica, Ariocarpus kotschoubeyanus

Taxonomy of the Cactaceae - Joël Lodé = Coryphantha difficilis
New Cactus Lexicon - David Hunt = Coryphantha difficilis

The International Plant Names Index : http://www.ipni.org
Coryphantha ((Engelmann) Lemaire 1868)
Coryphantha difficilis ((Quehl) Orcutt 1926)