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. Botanist Karl Moritz Schumann named it after Wilhelm Lenninghaus (1845-1918), a native of North Rhine-Westphalia who, in the 1880s, left his hometown of Ennepetal and emigrated to Porto Alegre, Brazil, where he became Guillermo Lenninghaus, and collected cacti for the German grower Haage.