Cereus validus Today I am going to look at a cactus, the fabulous Cereus validus . Cereus validus is sometimes named Cereus forbesii or Cereus haneanus . Cactus naming history is full of renaming and reclassification, largely a result of botanists, horticulturalists and scientists disagreeing. I tend to choose the cactus name that I prefer or see most commonly to label my plants. Cereus is a genus of cacti containing around 33 species. Cereus are desert cacti from South America, that tend to look like long columns. The word ‘cereus’ derives from the Latin word for ‘candle’, which is fitting, as these cacti look like long thin candles. The origin of the word ‘cereus’ is more interesting than this though, as it is derived from the Greek name Selene, a Greek moon goddess. Selene was thought to drive her moon chariot across the heavens. Cereus are sometimes called ‘nightblooming’ cacti, as they bloom after dark, which is cool, and explains the link to the moon
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