You may be looking for the character, Cowslip.


A fully bloomed cowslip

Cowslip is a plant that only the Owsla of the Sandleford Warren can eat. It was a delicacy among rabbits and as a rule, very few were left by the end of May, even among small warrens. Early in the novel, Watership Down, Toadflax caught Fiver trying to eat a piece, and Toadflax, Hazel, and Fiver got into a disruption about it.