Capsicum annuum 'NuMex twilight'

Numex twilight is one of the most unusual varieties of chilli pepper developed at New Mexico State University (which creates all "NuMex" breeds of plant). It grows about 45cm (18in) tall, and becomes covered in peppers that start out purple, then move through yellow and orange, becoming red when fully ripe, producing a rainbow effect on the green plant.

It is a hybrid based on the Thai Ornamental pepper.