A group of flowers borne on a common axis is called inflorescence. The common axis bearing the flowers is called peduncle. Stalk of the individual flower is called pedicel. Flowers develop on the peduncle in the axils of bracts.
The floral axis may be simple or compound. In unbranched condition the flowers are borne only on the branches which are called rachies.
The flowers that arise singly at the axil of vegetative leaf are solitary flowers. e.g., china rose.
Inflorescence may be of following types:
Terminal: Single flower present on floral axis, e.g., poppy.
Axillary inflorescence: When flower is found in the axil of a leaf, e.g., petunia.
Intercalary: Single flower present in between the floral axis.