Bhutan’s forests may bear a passing similarity to the great gardens of Cornwall, but you know you’re somewhere exotic when the forest floor is covered with these stunning cobra lilies, Arisaema nepenthoides. This particular arisaema gets its name because it resembles a pitcher plant (latin name Nepenthes). As well as looking pretty dramatic, Arisaema’s have an interesting sex life. Young plants are male, but become female when they mature, when they sport impressive spikes of orange fruit. If they are starved, they can become male again.