Depends on species, shapes of roots, stems, flowers and seedlings are different.
Choose the shape of your interest from the pictures below.
You can identify mangroves from their shape.

Root
Stem
Leaf
Flower
Fruit

stlit-roots

buttress

knee-roots

pneumatophores (thin)

pneumatophores (thick)

others (roots)


smooth

rough

lenticeld

others


ellipticaal

obovate (egg-shaped)

oval

others(leaves)


campanulate shape

blade shape

linear

others (flower)


pencil shape

ball shape

bean shape

others (fruits)



Note: Species in Rhizophoraceae, such as Rhizophora stylosa, Bruguiera gymnorrhiza, and Kandelia candel, develop usually 1 (rarely 2) seed in its fruit. A seed germinates in its fruit and develop out of its fruit like a seedling still undetached from the fruit. It is not an actual seed nor seedling, bat it is called fruit, viviparous seed, or propagule (propagating organ) in this Web-site.



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