Sporophylls and Spore Variations

Sporophylls produce clusters of sporangia known as “sori”

Groups of sporophylls form cone-like structures called “strobili” 

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The Inflorescence

The stem holding this whole reproductive portion of a plant is called a peduncle.

The major axis above the peduncle called rachis bears the flowers or secondary branches. Also, each flower stalk in the inflorescence is referred to as a pedicel.

Types of Inflorescence

Based on the mode of branching of the main axis or peduncle, the main groups of inflorescences are: 

simple (single)

2)  compound, 

3)  mixed, and 

4)  special

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Simple (single) and compound Inflorescence

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Racemose Inflorescence

It is an indefinite or indeterminate type of inflorescence Here, the flowers are arranged in one of two ways– acropetal or centripetal

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Pedicillate flower  (main axis elongated)

Simple raceme

Example: mustard (brassica campestris), radish (raphanus sativus)

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Panicle

Examples: Mangifera indica (mango), Azadirachta indica (neem), Delonix regia (Gulmohar), etc.

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Sessile flower (main axis elongated)

Spike

Examples: chaff flower (Achyranthes), bottle brush (Callistemon), Adhatoda vasica, Amaranthus