Gymnocalycium denudatum is a species of Gymnocalycium from Brazil to Argentina. Description Gymnocalycium denudatum is a solitary cactus with shiny, dark green, depressed spherical stems, 2–3 cm tall and 6–8 cm wide. It has 5–8 flat, minimally bumpy ribs with sparse areoles. Each areole bears 3–5 slightly twisted, whitish-yellow spines, 1–1.5 cm long, lying close to the stem. The plant produces pure white, glossy flowers up to 5 cm long and 7 cm wide, and elongated green fruits. The species is highly variable.
Distribution Native to Brazil (Rio Grande do Sul), Uruguay, Argentina (Misiones, Corrientes), and likely Paraguay, it grows at altitudes up to 500 meters.
Taxonomy Originally described as Echinocactus denudatus by Heinrich Friedrich Link and Christoph Friedrich Otto in 1828, Ludwig Mittler reassigned it to the genus Gymnocalycium in 1844. The epithet denudatum means "naked." References
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