There were 5 accepted species found [distribution filter:
1 Austrocactus bertinii (Cels)Britton&Rose distributionfilter: global
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links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
2 Austrocactus coxii (Schumann) Backeb. distributionfilter: global
homotypic synonyms:
Echinocactus coxii Schumann; Malacocarpus coxii (Schumann) Hosseus;
heterotypic synonyms:
Austrocactus intertextus (Phil.) Speg.;
Echinocactus intertextus Phil.;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
3 Austrocactus patagonicus (F.A.C.Weber ex Speg.) Hosseus distributionfilter: global
homotypic synonyms:
Cereus patagonicus F.A.C.Weber ex Speg.; Notocactus patagonicus (F.A.C.Weber ex Speg.) W.T.Marshall;
heterotypic synonyms:
Malacocarpus patagonicus (F.A.C. Weber) Britton & Rose;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
4 Austrocactus philippii (Regel & Schmidt) Buxb. distributionfilter: global
homotypic synonyms:
Cereus philippii Regel & Schmidt; Echinocactus philippii (Regel & Schmidt) Schumann;
Erdisia philippii (Regel & Schmidt) Britton & Rose;
heterotypic synonyms:
Austrocactus hibernus F.Ritter;
Echinopsis philippi (Regel & Schmidt) Nicolson;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr
5 Austrocactus spiniflorus (Phil.) F.Ritter distributionfilter: global
homotypic synonyms:
Corryocactus spiniflorus (Phil.) Hutchison;
Erdisia spiniflora (Phil.) Britton & Rose;
Opuntia spiniflora Phil.; heterotypic synonyms:
Echinocereus clavatus Schumann;
Echinocereus hypogaeus (F.A.C.Weber ex Regel) A.A.Weber ex Schumann;
Echinocereus hypogaeus Rumpler;
Eulychnia clavata Phil. ex Schumann;
Opuntia bicolor Phil.;
Opuntia clavata Engelm.;
links:    
IPNI (International Plant Names Index)   
WFO (World Flora Online)   
Google   
Flickr