A dandelion, for one, is a type of WEED that is found in many parts of the world. It is a flowering plant that belongs to the Asteraceae family and is characterized by its yellow flower head and white puffball seed head. The leaves are usually deeply lobed and have a jagged edge. Dandelions are considered a WEED because they can spread quickly and are difficult to remove from lawns and gardens. They are also edible and can be used in salads or as a tea.