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| Kingdom Plantae |
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Grusonia aggeria (Ralston & Hilsenb.) E.F. Anderson -- accepted |
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Grusonia densispina (Ralston & Hilsenb.) Rebman -- accepted |
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Opuntia aggeria Ralston & Hilsenb. -- not accepted -- Big Bend pricklypear |
| |
Opuntia densispina Ralston & Hilsenb. -- not accepted -- Big Bend pricklypear |
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