closely related to "drosera" is the portuguese dewy pine, "drosophyllum", which differs from the sundews in being passive. its leaves are incapable of rapid movement or growth. unrelated, but similar in habit, are the australian rainbow plants ("byblis"). "drosophyllum" is unusual in that it grows under near-desert conditions; almost all other carnivores are either bog plants or grow in moist tropical areas.