corymb . Example: Cauliflower. b. Umbel: An inflorescence with indeterminate central axis and pedicellate flowers arise from a common point of peduncle at the apex.
Example: Allium cepa . Compound umbel : It is a branched umbel. Each smaller unit is called umbellule .Example: Daucas carota , Coriandrum sativum . .
Main axis flattened: The main axis of inflorescence is mostly flattened (convex or concav) or globose. A head or capitulum is determinate or indeterminate, group of sessile or sub sessile flowers arising on a receptacle, often subtended by an involucre. a. Head: A head is a characteristic inflorescence of Asteraceae and is also found in some members of Rubiaceae and Mimosaceae.
Torus contains two types of florets: . Disc floret or tubular floret. . Ray floret or ligulate floret.
Based on the type of florets present, the heads are classified into two types. i. Homogamous head : This type of inflorescence exhibits single kind of florets. Inflorescence has disc florets alone.
Example: Vernonia, Ray florets alone. Example: Launaea . ii. Heterogamous head : The inflorescence possesses both types of florets.
Example: Helianthus, Tridax . Disc florets at the centre of the head are tubular and bisexual, whereas the ray florets found at the margin of the head which are ligulate and pistilate (unisexual). The flower and inflorescence are subtended by a lateral appendage called bract. In sunflower, you may notice that the whorl of bracts forms a cup like structure beneath mimicking the calyx.
Such whorl of bracts is called involucre. A group of bracts present beneath the sub unit of inflorescence is known as Involucre. II. Cymose inflorescence.
Central axis stops growing and ends in a flower, further growth is by means of axillary buds. Old flowers present at apex and young flowers at base E [ O Q U G Ukorng E{og Ukorng Fkejcukwo Oqpqejcukcn E{og Rqn{ejcukcn E{og Ueqtrkqkf Jgnkeqkf Figure . : Cyme . Simple cyme ( solitary ) : Determinate inflorescence consists of a single flower.
It may be terminal or axillary. Example: terminal in Trillium grandiflorum and axillary in Hibiscus . . Monochasial Cyme (uniparous):