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Mammillaria carmenae (Isla Carmen pincushion cactus) is a species of flowering plant in the family Cactaceae, native to 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 yellow down and bristles. In spring they bear pale cream or pink-tinged flowers with yellow centres.
M. carmenae is one of several Mammillaria species to be cultivated. In temperate regions it must be grown under glass with heat. It has gained the Royal Horticultural Society's Award of Garden Merit
- RHS A-Z encyclopedia of garden plants. United Kingdom: Dorling Kindersley. 2008. pp. 1136. ISBN 1405332964.