A genus of succulent plants in the cactus family, native to South America and known for their small, clustered bodies.
From the genus name in botanical Latin, possibly related to Greek 'geras' meaning old age, suggesting the wrinkled appearance of aged plants. The term was formally established in plant taxonomy to classify this specific group.
These tiny cactuses look like little pebbles, and plants that mimic rocks are called 'living stones'—nature's ultimate camouflage strategy in desert environments!
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