Drosera ramentacea is a sundew endemic to South Africa. The species is particularly known for its long, sprawling stem.

Drosera ramentacea is a large sundew with a rosette that reaches around 10 cm in diameter. The rosette grows at the end of a long stem that is usually around 10-30 cm long but can reach a meter in exceptional conditions. The leaves are long and semi-raised, with a dilated lamina at the end of a thin, fleshy petiole. The lamina is conspicuously curved, forming an abrupt attachment to the petiole. The petioles are covered with a moderately dense layer of furry hairs. The flower scapes usually bifurcate towards the flowers.

The species grows in very steep fynbos in the mountains of the Western Cape. It is mainly distributed from the Riviersonderand Mountains west towards the Cape Peninsula. Within the habitat, the plants usually occur around exposed, well-drained rocky slopes. It usually grows between bushes and around medium sized rocks. The plants are winter-growing and flower in late spring-early summer before entering dormancy.

Drosera ramentacea is most morphologically similar to Drosera capensis, but differs in that the hairs that cover the plant are longer and more conspicuous (D. capensis is usually less hairy). It also has a higher propensity to form a stem and grows in well-drained habitats (D. capensis generally forms stems to a lesser extent and is restricted to perennially wet niches). D. ramentacea is also similar to D. hilaris, can both species can share the same habitat. D. ramentacea is distinguished by its more slender leaves, especially in the petioles (the leaves of D. hilaris are much broader).