Step 1: Understanding the Concept:
A gynoecium is called multicarpellary when a flower has more than one carpel, and syncarpous when those carpels are fused together into a single unit rather than staying separate.
Step 2: Name real examples.
Hibiscus (China rose) has a gynoecium made of five carpels fused into one, so it is multicarpellary and syncarpous.
Tomato (Solanum lycopersicum) also has several carpels fused into a single compound ovary, making it another clear example.
Final Answer:
Hibiscus and tomato are two common plants with a multicarpellary syncarpous gynoecium.