在墨西哥北部的干旱地区,到处可看到一种含有橡胶乳液的热带灌木——银胶菊。由于合成橡胶需大量石油,天然橡胶又供不应求且不断涨价,因此银胶菊越来越引起人们的重视。银胶菊性喜温暖,但也能耐高温干旱和严寒,在贫瘠的土地上也能生长。有趣的是,在气候寒冷或干燥的情况下, In the arid regions of northern Mexico, a tropical shrub with rubber emulsions is seen everywhere. Because synthetic rubber needs a large amount of oil, natural rubber is in short supply, and prices continue to rise. Therefore, ginko chrysanthemum is getting more and more attention. Geranium is warm and warm, but it is also resistant to high temperatures, droughts and cold, and can grow on barren land. Interestingly, in the cold or dry climate,