There were 2 accepted species found [distribution filter:
1 Denmoza ducis-pauli (C.F. Först. ex Rumpler) Werderm. ex Backeb. distributionfilter: global
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links:    
WFO (World Flora Online)   
Google   
Flickr
2 Denmoza rhodacantha (Salm-Dyck) Britton & Rose distributionfilter: global
homotypic synonyms:
Echinocactus rhodacanthus Salm-Dyck; heterotypic synonyms:
Cereus erythrocephalus A. Berger;
Cereus rhodacanthus (Salm-Dyck) F.A.C. Weber;
Denmoza erythrocephala (Schumann) A. Berger;
Echinopsis rhodocantha (Salm-Dyck) C.F. Först.;
Pilocereus erythrocephalus Schumann;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr