Hibbertia sulcata

Hibbertia sulcata is a species of flowering plant in the family Dilleniaceae and is only known from a single specimen collected in Arnhem Land in the Northern Territory. It is a small, sprawling shrub with wiry branches, linear leaves and yellow flowers arranged singly or in pairs in leaf axils with 22 to 24 stamens arranged in groups around two densely scaly carpels.

Description
Hibbertia sulcata is a shrub that typically grows to a height of up to 20 cm and has wiry branches and scaly foliage. The leaves are linear, mostly 20–35 mm long, 1.2–1.6 mm wide and more or less sessile. The flowers are arranged singly or in pairs in leaf axils on a thread-like peduncle 3.3–5.7 mm long, with linear bracts about 1 mm long at the base. The five sepals are joined at the base, the two outer sepal lobes 2–2.5 mm long and 2 mm wide, and the inner lobes longer and broader. The five petals are wedge-shaped with two lobes, yellow, 4.2–5.6 mm long and there are 22 to 24 stamens arranged around the two densely scaly carpels, each carpel with two ovules.

Taxonomy
Hibbertia sulcata was first formally described in 2010 by Hellmut R. Toelken in the Journal of the Adelaide Botanic Gardens from a specimen collected in north-eastern Arnhem Land in 2002. The specific epithet (sulcata) means "furrowed", referring to the edges of the leaves.

Distribution
This hibbertia is only known from a single specimen collected from the Gudjekbinj outstation.

Conservation status
Hibbertia sulcata is classified as "data deficient" under the Northern Territory Government Northern Territory Government Territory Parks and Wildlife Conservation Act 1976.