Jacksonia sericea, commonly known as waldjumi,[2] is a species of flowering plant in the family Fabaceae and is endemic to the south-west of Western Australia.

It is a spreading to prostrate shrub with greyish-green branches, straight, sharply-pointed side branches, leaves reduced to scales, orange flowers with red markings, and woody, densely hairy pods.

[2][3] Jacksonia sericea was first formally described in 1837 by George Bentham in Stephan Endlicher's Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel.

[6] This species of Jacksonia grows in sandy soil over limestone, and is found in Perth suburbs between Wanneroo and Mandurah in the Swan Coastal Plain bioregion of south-western Western Australia.

[2][3] Waldjumi is listed as "Priority Four" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[2] meaning that it is rare or near threatened.