(i) Trimerous: The number of stamens of a flower is 3 or a multiple of 3 is called Trimerous. Flowers of monocots are trimerous. For example – rosin, rice, wheat etc.
(ii) Tetramerous: The number of stamens of the flower is 4 or a multiple of 4 is called Tetramerous. Flowers of dicotyledonous plants are Tetramerous. For example, paint.
(iii) Pentamerous: The number of stamens of a flower is 5 or a multiple of 5 is called Pentamerous. Flowers of dicotyledonous plants are pentamerous. For example – Jawa.