Members of the Poaceae family use benzoxazinoids an alkaloids derived from tryptophan as constitutively produced defensive secondary metabolites. 

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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

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Spikelet

Examples: wheat, barley, sorghum, oats etc.  Poaceae family

Spikelet

The central axis of the inflorescence is called a rachis

Spikelets have two scaly bracts present at the base called glumes

Number of florets per spikelet vary in different species