全世界肉质植物中的仙人掌类，有2000余种，其中墨西哥就有100O多种，真是名副其实的“仙人掌之国”。仙人掌是墨西哥的象征，被定为“国花”，此外，墨西哥的国旗、国徽和货币上的图案都有仙人掌。仙人掌大多分布在热带、亚热带的沙漠地区，那里缺乏水分和有机质，土壤常盐渍 Cactuses in the world succulent plants, there are more than 2,000 species, of which there are more than 100O Mexico, is truly a “cactus country.” Cactus is a symbol of Mexico, was designated as “national flower”, in addition, Mexico’s national flag, national emblem and currency patterns have cacti. Cactus are mostly distributed in the tropical and subtropical desert areas, where there is a lack of water and organic matter, soil often salted