Calendula (calendula officinalis) is a member of the compositae family. Many plants in this family have health benefits, like chamomile, dandelion, arnica, golden rod, and sunflowers. Lettuce and endive are also from this botanical family. The key feature of this family is flowers with ray petals. Each petal is actually an individual floret and each flower is made up of several rows of florets around a centre disk.