The individual parts of an aggregate fruit come in many forms. The components of other aggregate fruit are more difficult to define. Botanically it is termed an aggregate fruit, composed of small drupelets. An aggregate fruit that consists of follicles may be called a follicetum. The purple-black aggregate fruit is under a centimeter long. The aggregate fruit of the rose is a berry-like structure called a rose hip. It is a large aggregate fruit, with large seeds and a deep maroon color. An aggregate fruit, or "etaerio", develops from a single flower with numerous simple pistils.