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What are trimerous flowers ? Which group...

What are trimerous flowers ? Which group of plants has trlmerous flowers ?

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Trimerous flowers are those, where the flora appendages are in threes or multiples of three Monocotyledonous plants generally have trimerous flowers growing in marshy/swampy areas, where oxygen is deficient in the soil. These roots help the plants to get oxygen from the air for respiration.
eg: Rhizophora.
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