Knowlton's cactus
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Related to Knowlton's cactus: Pediocactus knowltonii
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| Noun | 1. |  Knowlton's cactus - small clustering cactus of southwestern United States; a threatened speciescactus - any succulent plant of the family Cactaceae native chiefly to arid regions of the New World and usually having spines genus Pediocactus, Pediocactus - low-growing cacti of the Great Plains of North America |
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