1. A flower which has calyx , corolla or perianth in multiples of 3 is called trimerous flower.
2. Trimerous flowers have parts arranged in groups of three.
3. Root word:
Tri = three
Merous = having parts
EXAMPLES:
1. Iris
2. Trillium
3. Daylillies
4. Allium Onion
5. Garlic