also can be entire or toothed. Resin or latex also can be present in the leaves. Inflorescences Nearly all Asteraceae bear their flowers in dense flower heads called capitula. They are surrounded by involucral bracts, and when viewed from a distance, each capitulum may appear to be a single flower. Enlarged outer (peripheral) flowers in the capitulum may resemble petals, and the involucral bracts may look like a calyx. Floral heads In plants of the family Asteraceae, what appears to be a single flower is actually a cluster of much smaller flowers. The overall appearance of the cluster, as a single flower, functions in attracting pollinators in the same way as the structure of an individual flower in some other plant families. The older family name, Compositae, comes from the fact that what appears to be a single flower is actually a composite of smaller flowers. The "petals" or "sunrays" in a sunflower head are actually individual strap-shaped flowers called ray flowers or ray florets, and the "sun disk" is made of smaller circular shaped individual flowers called disc flowers or disk florets. The word aster means "star" in Greek, referring to the appearance of some family members, as a star surrounded by rays. The cluster of flowers that may appear to be a single flower is called a head. The entire head may move tracking the sun, like a "smart" solar panel, which maximizes reflectivity of the whole unit and can thereby attract more pollinators. On the outside the flower heads are small bracts that look like scales. These are called phyllaries, and together they form the involucre that protects the individual flowers in the head before they open. The individual heads have the smaller individual flowers (florets) arranged on a round or dome-like structure called the receptacle. The florets mature first at the outside, moving toward the center, with the youngest in the middle. The individual flowers in a head have 5 fused petals (rarely 4), but instead of sepals, they have threadlike, hairy, or bristly structures singularly called a pappus, plural pappi, which surround the fruit and can stick to animal fur or be lifted by wind, aiding in seed dispersal. The whitish fluffy head of a dandelion, commonly blown on by children, is made of pappi with tiny seeds attached at the ends. The pappi provide a parachute like structure to help the seed be carried