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Myrtillocactus sp. in flower
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M. karwinskiana in the open
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Big old M. karwinskiana almost solitary
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Unidentified cereus sp. in flower on the
hilltop
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M. karwinskiana dividing dichotomously
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and two will be four...
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Dichotomous division almost complete
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White and woolly M. karwinskiana form
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