It is an erect, aromatic shrub with sticky, hairy foliage, linear or oblong to narrow lance-shaped leaves, and heads of creamy-white flowers arranged in a dense corymb.

Cassinia longifolia is an erect, aromatic shrub that typically grows to a height of 1.2–2.5 m (3 ft 11 in – 8 ft 2 in), its foliage covered with short, glandular hairs and sticky.

[2][3] Cassinia longifolia was first formally described in 1818 by Robert Brown in the Transactions of the Linnean Society of London.

[6] Shiny cassinia grows in forest and disturbed places, especially after fire, and often on ridges.

It occurs in south-eastern New South Wales, the Australian Capital Territory and is widespread and common in eastern Victoria.