(a) aestivation: The mode of arrangement of sepals or petals in floral bud with respect to the other members of the same whorl is known as aestivation.
(b) placentation: The arrangement of ovules within the ovary is known as placentation.
(c) actinomorphic: When a flower can be divided into two equal radial halves in any radial plane passing through the centre, it is said to be actinomorphic.
Example: Mustard, Datura, Chilli.
(d) zygomorphic: When a flower can be divided into two similar halves only in one particular vertical plane, it is zygomorphic.
Example: Pea, Gulmohar, Bean, Cassia.
(e) superior ovary: Also called as Hypogynous flower. In the hypogynous flower the gynoecium occupies the highest position while the other parts are situated below it. The ovary in such flowers is said to be superior.
Example: Mustard, China rose, Brinjal.
(f) perigynous flower: If gynoecium is situated in the centre and other parts of the flower are located on the rim of the thalamus almost at the same level, it is called perigynous The ovary here is said to be half inferior.
Example: Pium, Rose, Peach.
(g) eplpetalous stamen: When stamens are attached to the petals, they are epipetalous.
Example: Brinjal.
