Field number : RH 0052
Collector : Ralf Hillmann
Species : Sclerocactus parviflorus v. intermedius 
Locality : USA : (Colorado Mesa Co. Colorado Nat. Monument 2200 m)
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Taxonomy of the Cactaceae - Joël Lodé = Sclerocactus parviflorus subsp. intermedius
New Cactus Lexicon - David Hunt = Sclerocactus parviflorus subsp. intermedius
The International Plant Names Index : https://www.ipni.org
Sclerocactus (Britton & Rose 1922)
Sclerocactus parviflorus (Clover & Jotter 1941)
http://sclerocactus-aventures.com
Semeurs de cactus