Greene Jacksonia ramosissima is a species of flowering plant in the family Fabaceae and is endemic to Queensland.

It is an erect, densely-branching, soft shrub with leaves reduced to egg-shaped, greyish scales, yellow-orange flowers densely arranged near the ends of branches, and woody, elliptical fruit densely covered with white hairs.

[2] Jacksonia ramosissima was first formally described in 1848 by George Bentham in Thomas Mitchell Journal of an Expedition into the Interior of Tropical Australia.

[5] This species of Jacksonia grows in woodland in sandy loam over sandstone or laterite in northern inland Queensland.

[2] This species is listed as of "least concern" by the Queensland Government Nature Conservation Act 1992.