Leucopogon costatus

Leucopogon costatus, commonly known as twiggy beard-heath, is a species of flowering plant in the heath family Ericaceae and is endemic to southern continental Australia. It is an erect or straggling shrub with broadly egg-shaped, stem-clasping leaves, and white, tube-shaped flowers, the petals densely bearded on the inside.

Description
Leucopogon costatus is a slender, erect or straggling erect shrub that typically grows to a height of up to 50 cm and has softly-hairy young branchlets. Its leaves are broadly egg-shaped, 1.5–5 mm long and 1.0–3.5 mm wide with a stem-clasping base. The flowers are arranged in spikes of up to four 4–7 mm long in leaf axils or on the ends of branches, with egg-shaped bracteoles 1.0–1.3 mm long at the base. The sepals are egg-shaped, 1.6–2.3 mm long, the petals white and joined at the base to form a cylindrical or bell-shaped tube 1.1–1.5 mm long, the lobes 1.2–1.8 mm long and densely bearded on the inside.

Taxonomy
Twiggy beard-heath was first formally described in 1885 by Ferdinand von Mueller who gave it the name Styphelia costata in Southern Science Record from specimens collected by Otto Tepper on Kangaroo Island. In 1918, John McConnell Black changed the name to Leucopogon costatus in the Transactions and Proceedings of the Royal Society of South Australia. The specific epithet (costatus) means "ribbed".

Distribution and habitat
Leucopogon costatus grows mallee, scrub and heathland in the Little Desert National Park and southern Big Desert regions of Victoria and in the south-east of South Australia, including Kangaroo Island.