Spyridium spadiceum is an erect slender, or weak semi-prostrate shrub that typically grows to a height of 0.15–3 m (5.9 in – 9 ft 10.1 in), its branches covered with soft, sometimes rust-coloured hairs.

The leaves are narrowly oblong to oval, 1–3 mm (0.039–0.118 in) long, softly-hairy on the upper surface and white on the lower side, the veins sometimes covered with rust-coloured hairs.

[2][3] This species was first formally described in 1837 by Eduard Fenzl who gave it the name Trymalium spadiceum in Enumeratio plantarum quas in Novae Hollandiae ora austro-occidentali ad fluvium Cygnorum et in sinu Regis Georgii collegit Carolus Liber Baro de Hügel.

[7] Spyridium spadiceum grows on granitic hills in the Porongurup Range and at Albany in the Jarrah Forest bioregion in the south of Western Australia.

[3][8] Spyridium spadiceum is listed as "Priority Four" by the Government of Western Australia Department of Biodiversity, Conservation and Attractions,[3] meaning that it is rare or near threatened.