Coronidium rupicola

Coronidium rupicola, commonly known as the yellow button, is a flowering plant in the family Asteraceae. It is a small, upright, perennial shrub with yellow flowers borne on a single stem and is endemic to Queensland, Australia.

Description
Coronidium rupicola is a small, shrubby, erect perennial with a single stem and terminal yellow button flower-heads about 2 cm in diameter. Unlike other species of Coronidium it doesn't have conspicuous, large bracts, instead a ring of smaller, narrow light-coloured bracts. The florets are thickly crowded with a greenish centre. The flowers in bud are thickly covered with long, whitish hairs, new growth stems silvery and woolly. The leaves are narrow, lanceolate, 5 cm long, pale green, densely woolly underneath, upper surface smooth, margins rolled under and wavy. Flowering occurs throughout the year and the fruit is a cypsela.

Taxonomy
This species was first described in 1838 by Augustin Pyramus de Candolle as Helichrysum rupicola. In 2008 Paul Graham Wilson published a paper titled "Coronidium, a new Australian genus in the Gnaphalieae (Asteraceae)", in which he erected the new genus Coronidium and transferred this species to it. It was published in the journal Nuytsia.

Etymology
Wilson coined the genus name Coronidium from the Greek words korone (crown) and the diminutive -idion, a reference to a feature seen on the fruit after bristles have broken away from it. The specific epithet rupicola is derived from the Latin words rūpēs meaning "cliff", and -cola meaning "to inhabit", and is a reference to the habitat where this species is found.

Distribution and habitat
Yellow button is endemic to Queensland and grows on rocky coastlines, road verges, woodland and exposed ridges.