Variegation in plants is a phenomena in which leaf tissue partly or nearly entirely lacks green pigmentation. Variegation can occur in different colors and shades, mostly whitish or yellowish, and often lends ornamental value to the plants in which it occurs. As such, many common houseplants are variegated. Because variegation affects the pigmentation of leaves, and localization of chloroplasts (which provide plants all of their energy), it reduces the fitness of plants in the wild. While chance mutations do arise in wild plants leading to variegation, these traits are rapidly lost in wild populations.
A few weeks ago I was working with some Camelina at the Danforth Center on a project using the Bellweather Phenotyper, and amongst the over 1,000 plants growing in the phenotyping growth house, we noticed one that looked visibly sickly from a distance. As the plants were cycled through the phenotyper, and the sickly individual got closer, I realized it was actually just variegated! It's the first variegated Camelina plant I've ever seen, and it looks awesome.
There are many known mutations that can cause variegation in the close relative and model system, Arabidposis thaliana, so I won't speculate what could be the cause, and it's yet to be seen if this is a heritable trait.