The leaves are narrow linear to narrow lance-shaped, 10–40 mm (0.39–1.57 in) long and 1–4 mm (0.039–0.157 in) wide, the upper surface of the leaves glossy green and sticky, the edges rolled under and the lower surface densely covered with white, woolly hairs.
The flower heads are 4–6 mm (0.16–0.24 in) long and bronze-coloured, fading to straw-coloured or greenish-cream, each head with four to six creamy-white florets surrounded by sixteen to twenty overlapping involucral bracts in four whorls.
The heads are arranged in groups of several hundred in a dense, round-topped corymb 10–85 mm (0.39–3.35 in) in diameter.
Flowering occurs from February to March and the achenes are 1.2–1.5 mm (0.047–0.059 in) long with a pappus of 23 to 26 bristles.
[2][3][4] Cassinia maritima was first formally described in 2004 by Anthony Edward Orchard in Australian Systematic Botany from specimens collected near Thredbo in 2004.