Features of FlowersFlowers arise from apical meristems similar to vegetative shoots but, unlike them, have determinate growth. The floral primordia develop into four different kinds of specialized leaves that are borne in whorls at the tip of the stem (see Figure 1 ). The two outer whorls are sterile, the inner two fertile. The first formed outer whorl—the calyx— is the most leaflike and its individual parts, the sepals, often are green. The petals of the next whorl, the corolla, frequently are brightly colored and in a majority of flowers retain some semblance to leaves. (Together the calyx and the corolla are called the perianth.) The next two whorls, the androecium and the gynoecium, are composed of highly modified reproductive structures that have lost their leaf-like appearance. The androecium is composed of stamens
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