Drosera erythrogyne is the longest species of sundew, with stems that are known to grow three meters long! It is bright green and glabrous except for the sepals, which have a dense covering of glands. The central stem is fleshy and wavy, which along with the arched petioles, give the plants a messy profile. It is contrasted from the somewhat similar Drosera pallida by its slightly reniform leaves, which remain bright green (D. pallida has orbicular lamina, which are often red)

The species is a strong climber, using its leaves to latch onto surrounding vegetation. It is found near swamps and next to granite outcrops along the south coast of Western Australia.