Drosera coomallo is a pygmy species native to the laterite hills of the Geraldton sandplains. It forms a small unremarkable flat rosette of leaves. The flower is however very attractive, with petals that develop an intense metallic orange colouration. It can be distinguished from its closest relative, D. miniata by its peduncle, which has a dense covering of trichomes. The species grows atop lateric hills.