organ pipe cactus
noun
1- a large cactus native to the south-western US, having columnar stems or branches and typically flowering at night群戟柱属仙人掌。
1.1
- Several species in the family Cactaceae, including Lemaireocereus marginatus and Cereus thurberi.仙人掌科中数种, 包括白云阁和仙人柱（或天轮柱）。