Mammillaria nana
A small clustering Mammillaria from the central Mexican highlands at about 1,800–2,400 m; often treated as part of M. crinita, though GBIF accepts it. It wants bright light, a cool, completely dry winter, and summer rain.
Where it grows wild
High grassland and xerophytic scrub on rocky ground, often tucked among grasses and stones; generalised from small highland Mammillaria.
Recorded sites at about 1,840–2,440 m.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 4.0 licence, unmodified.