An individual without gonads will leave no genes to the next generation. Gonads and genitalia are called primary sexual traits.

Secondary sexual traits, which differ between the sexes but do not play a direct role in reproduction.

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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

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Catkin

Examples:

Morus alba (mulberry), Betula (birches), Qercus (oaks), Salix (willows), etc.

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Spadix

The spadix is enclosed by leaf-like large, bright, colourful and curved bracts known as a “spathe”. 

Spadix

Examples: Present in the plants of family 

Araceae (arums), Musaceae, Palmaceae

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(main axis short)

Corymb

Examples: Candytuft, Lantana and Cherry

Compound corymb

Examples: Cauliflower

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Simple Umbel

Examples: Centella asiatica (Brahmi), Allium cepa (onion), Fatsia japonica (paper plant), Primula veris (cowslip), etc.

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Compound umbel

Example: 

Coriandrum sativum (coriander), Foeniculum vulgare (fennel), Daucus carota (carrot), Conioselinum pacificum (parsley), etc.