Field number : LZ 21
Collector : Eberhard Lutz
Species : Escobaria alversonii 
Locality : USA : California (Joshua Tree) * Geocode
Date : 31/07/1986
Notes :
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Taxonomy of the Cactaceae - Joël Lodé = Escobaria alversonii
New Cactus Lexicon - David Hunt = Escobaria alversonii
The International Plant Names Index : https://www.ipni.org
Escobaria (Britton & Rose 1923)
Escobaria alversonii ((J.M.Coult.) N.P.Taylor 1997)
Semeurs de cactus