A spineless, dome-shaped cactus(Lophophora williamsii) native to Mexico and the southwest United States, having buttonlike tubercles that are chewed fresh or dry as a narcotic drug by certain Native American peoples.

• 佩奥特掌一种无刺的圆形仙人掌（乌羽玉乌羽玉属），原长于墨西哥和美国西南部，有钮扣形小块茎，新鲜或者晒干的佩奥特掌被某些土著美洲人当作麻醉药咀嚼