Merosity

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.