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Definition of Knowlton's cactus
1. Noun. Small clustering cactus of southwestern United States; a threatened species.
Exact synonyms: Pediocactus Knowltonii
Generic synonyms: Cactus
Group relationships: Genus Pediocactus, Pediocactus
Generic synonyms: Cactus
Group relationships: Genus Pediocactus, Pediocactus