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The very spiny stem of Echinopsis formosa, a cylindrical cactus native to western Argentina. It can grow to as much as 2m tall but is more typically 50-100cm tall It has yellow, 6-8cm long flowers. The mature spines often appear to have clipped ends as the brittle tips often break off. echinopsis-2940htm'>Echinopsis. Order: Caryophyllales, Family: Cactaceae