如果我们系统地观察植物的各种器官,就会发现,同一种器官在不同的植物中往往形态差异很大。花萼是花最外一层包被,多数是绿色的,主要对花起保护作用,但也有一些种类的花萼,变得酷似花冠,五颜六色、形态迥然。唇形科的一串红(Salvia splendens),一年生草本花卉。金秋时节,花坛里、行道旁,万绿丛中鲜红如血。花冠 If we systematically observe the various organs of plants, we will find that the same organ often varies widely in different plants. Calyx is the outermost coat of flowers, most of them green, mostly protective of flowers, but there are also some species of calyx that become resembled corolla, colorful and utterly different. Salvia splendens of the Labiatae family, annual herb flowers. Autumn season, flower beds, next to the road, green leaves bright red blood. corolla