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Neoporteria
http://www.desert-tropicals.com/Plants/Cactaceae/Neoporteria.html
Images of many species.
Neoporteria Species
http://www.viridis.net/cactus/chile/neoporteria.html
Images of two plants in Chile.
Neoporteria subgibbosa
http://www.dcs.gla.ac.uk/~bunkenba/Cacti/Neoporteria/subgibbosa.html
Image.