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Lemon Ball cactus (Parodia leninghausii aka Notocactus leninghausii).

Parodia leninghausii is a species of South American cactus commonly found as a houseplant. Common names include Lemon Ball, Golden Ball and Yellow Tower cactus.

If you want more information about this flower, just search the plant's Latin name on Google:

cactus

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