What is the plant
Mammillaria wrightii Engelm. Plants usually unbranched. Roots: upper portion of primary root somewhat thickened and succulent proximally, otherwise fibrous. Stems flat-topped or spheric, 4-8 × 4-8 cm, ± flaccid; tubercles 6-24 mm; axils appearing naked; cortex and pith mucilaginous; latex absent.
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