Field number : MZ 156
Collector : Milan Zachar
Species : Echinomastus unguispinus v. laui 
Locality : Salinas, San Luis Potosi, Mexicó
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Taxonomy of the Cactaceae - Joël Lodé = Echinomastus unguispinus subsp. laui
New Cactus Lexicon - David Hunt = Sclerocactus unguispinus
The International Plant Names Index : https://www.ipni.org
Echinomastus (Britton & Rose 1922)
Echinomastus unguispinus ((Engelm.) Britton & Rose 1922)
http://echinomastus.succulentstreasures.com
Semeurs de cactus