Drosera erythrogyne is the longest species of sundew, with stems that are known to grow three meters long!

Drosera erythrogyne is a tuberous sundew with a long erect stem. The stem is bright green and glabrous, distinctly wavy and commonly reaching 1.5 m in length. In recently burnt areas, the plants reach more than 2 meters (with some specimens growing up to 3m). The petioles are long and arching, with lamina that are slightly notched or flattened at the top. The sepals have a dense covering of glands. The flowers are white and the styles are long and straight. It is named after its deep red ovaries which are visible in open blooms.

Drosera erythrogyne is found near swamps and next to granite outcrops along the south coast of Western Australia. It is commonly found in sparse woodland environments. The species is most similar to Drosera pallida, which has similarly long glabrous stems and similar floral morphology. It is best distinguished by its slightly reniform leaves, which remain bright green (D. pallida has orbicular lamina, which are often red).