From the genus primula Cowslip is a flowering plant. It usually grows in the most temperate climate in Western Asia and Europe.
Cowslip which real name is Primula veris is part of the primrose family Primulaceae. [Source: Wikipedia]
So can rabbits eat cowslip?
No, they cannot eat this flower at all.
This is because cowslip is poisonous to rabbits and therefore should never be eaten by a rabbit.
Make sure you avoid having your rabbit eat this flower at all.