"Echinocactus" .
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"Echinocactus polycephalus Engelm. and Bigelow" .
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"Caryophyllales" .
"Cottontop Cactus" .
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"Magnoliophyta" .
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"Engelm. and Bigelow" .
"Echinocactus polycephalus" .
"Cactaceae" .
"Plantae" .
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"Magnoliopsida" .
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