Sorry for the delays, all. It never ceases to amaze me how busy things can get.
Known commonly in English as lemon ball, golden ball or yellow tower cactus, Parodia leninghausii is a columnar cactus species native to southernmost Brazil. Taxonomically, it has been placed in several different genera over its history since first publication in 1895, having been placed in Parodia in 1982.
Karl Moritz Schumann, a German botanist, named the species after Wilhelm Lenninghaus, a collector for the German cactus nursery, Haage. I don’t often link to commercial sites, but I’m duly impressed by a nursery that’s been in business for nearly 2 centuries with an intriguing history, including this snippet: “In the Third Reich the ‘non-Aryan’ cactus had to live underneath the tables”. I wonder how different cacti species were separated into these groups — place of origin? collector? appearance? Baffling.
Additional photographs of this species are available from Wikimedia (Parodia leninghausii in Huntington Botanical Garden) and via Smith College Botanic Garden: Parodia leninghausii.