Mammillaria carmenae, the Isla Carmen pincushion cactus, is a species of flowering plant in the family Cactaceae.

It is native to Tamaulipas state, in eastern central Mexico.

It grows to 8 cm (3 in) tall by 15 cm (6 in) broad. The clustered egg-shaped stems, 3–4 cm thick, are covered in creamy-coloured yellow down and bristles. In spring they bear pale cream or pink-tinged flowers with yellow centres.

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