Drosera ramellosa is a fan leaved tuberous sundew endemic to Western Australia. The species has 1-3 erect stems that arise from a basal rosette. The leaves on the erect stem are alternating and have short petioles. Generally, the colour is yellow-green although sometimes it is blushed with red or orange. The inflorescence emerges directly from the basal rosette and terminates close to the ground.

The species grows in winter wet soils particularly in the drainage basins of granite outcrops or on banks of small lakes. It is widespread, occurring from the west of the Nullarbor Plain, along the south coast and up the west coast past Geraldton.

Drosera ramellosa is closely related to other members of the subgenus Stolonifera and shares many common characteristics such as a fleshy inflorescence, fan-shaped leaves and white flowers. It is most similar to Drosera platypoda, which also has erect stems and alternating leaves. D. ramellosa is distinguished by its inflorescence, which emerges directly from the basal rosette (those of D. platypoda emerge at the end of the leaved stems).