Merosity
Number of floral parts per whorl is called merosity. Perianth merosity is the
number of perianth parts per whorl.
1.
Isomerous: Presence of same number of perianth parts in different whorls of a flower. (five sepals,
five petals). Example: Hibiscus.
2. Anisomerous:
Each whorl of flower contains
different number of members. Example: Annona.
3.
Bimerous: Floral
parts in two or multiples of two.
Example: Ixora
4. Trimerous: Floral parts in three or multiples of three. Example: Allium, Monocots.
5. Tetramerous: Floral
parts in four or multiples of four.
Example: Brassica juncea.
6. Pentamerous:
Floral
parts in five or multiples of five.
Example: Hibiscus, Dicots.
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