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Opuntia stenopetala
Opuntia stenopetala is from Mexico. It has variously been known as O. arrastradillo, O. grandis, O. marnieriana, and O. riviereana. The species is found sporadically in nothern Mexico in many locations (apparently northeastern Mexico). The plants are low growing. One photo at Flickr shows the markings that are present on some plants (stressed plants?).
You can find an early description of O. stenopetala here.

Flower of Opunia stenopetala, photograph by Zoya Akulova, click to enlarge and see floral details (© 2009 Zoya Akulova)
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Opuntia stenopetala in flower, by Michael Wolf
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Opuntia stenopetala, by Stan Shebs
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Opuntia stenopetala, photographed at B&B Nursery, Tucson, AZ | 
Opuntia stenopetala, photographed at B&B Nursery, Tucson, AZ |

Opuntia stenopetala, photographed at B&B Nursery, Tucson, AZ |

Opuntia stenopetala, photographed at B&B Nursery, Tucson, AZ
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Opuntia stenopetala, by Fernando
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Close-up of plant at immediate left
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Opuntia stenopetala, photographed at B&B Nursery, Tucson, AZ |
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