Syngenesious  

Filaments free and anther are united. e.g., Sunflower (asteraceae)

Synandrous

Stamens fused all through their length. e.g., Cucurbita 

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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.

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(main axis flattened)

Capitulum (head)

The peduncle is reduced to a flat, concave, or convex disc, the receptacle that bears small sessile and centripetally arranged flowers called florets, surrounded by an involucre of bracts

Examples: Helianthus annuus (Sunflower), Zinnia, Tagetes erecta (Marigold), Cosmos, Mimosa pudica (touch-me-not), Acacia, etc.