Thornber's nipple actus (Mammillaria thornberi)
Description
This species occurs in southwestern Arizona, USA, and northwestern Sonora, Mexico at elevations of 240 to 720 m asl.
Taxonomic tree
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Domain: Eukarya
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Kingdom: Plantae
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Phylum: Magnoliophyta
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Class: Magnoliopsida
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Order: Caryophyllales
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Family: Cactaceae
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Genus: Mammillaria
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