Plants which become dormant during summer are known as

Plants that become dormant during summer are known as Caducous.
The caduceus is dropping off or shedding at an early stage of development, like the gills of most amphibians or the sepals or stipules of certain plants. Detaching or dropping off at an early stage of development. The gills of most amphibians and the sepals or stipules of certain plants are caducous.