Merosity
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Merosity refers to the number of component parts in a distinct whorl of a plant structure. The term is most commonly used in the context of a flower where it refers to the number of sepals in a whorl
Trimerous flower of Tulipa clusiana (the three sepals resemble petals)
Tetramerous flower of Correa alba
Pentamerous flower of Crassula ovata
Petal
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Petals are modified leaves that form an inner whorl surrounding the reproductive parts of flowers. They are often brightly coloured or unusually shaped to attract pollinators. All of the petals of a f
Merosity
…structure. The term is most commonly used in the context of a flower where it refers to the number of sepals in a whorl of the calyx, the number of petals in a whorl of the corolla, the number of stamens in a whorl of the androecium, or the number of carpels in a whorl of the gynoecium. The term may also…
Tetrameric flower of a primrose willowherb (Ludwigia octovalvis) showing petals and sepals
Pelargonium peltatum flowers resemble those of geraniums, but are conspicuously zygomorphic.
Geranium incanum, with an actinomorphic flower typical of the genus