Boronia grimshawii

Boronia grimshawii is a plant in the citrus family Rutaceae and is endemic to mountain ranges in central Queensland, Australia. It is an erect shrub with many branches, simple leaves with a densely hairy, pale underside, and pink, four-petalled flowers.

Description
Boronia grimshawii is an erect, many-branched shrub which grows to a height of about 1.5 m with its young branches densely covered with white, star-shaped hairs. The leaves are elliptic to lance-shaped, 10-26 mm long and 4-10 mm wide with a petiole 1-2 mm long. The lower surface of the leaf is a slightly paler colour than the upper surface. Up to three pink to white flowers are arranged on a stalk 0.5-2 mm long. The four sepals are egg-shaped to triangular, densely hairy, 2-2.5 mm long and 1-2 mm wide. The four petals are 6-10 mm long, 4-6 mm wide but enlarge slightly as the fruit develops. The eight stamens alternate in length with those opposite the petals shorter than those near a sepal. Flowering occurs from June to October and the fruit are about 5 mm long and 2.5 mm wide.

Taxonomy and naming
Boronia grimshawii was first formally described in 2003 by Marco F. Duretto and the description was published in the journal Muelleria from a specimen collected near the property "Bronte Station". The specific epithet (grimshawii) honours the Australian botanist Paul Grimshaw.

Distribution and habitat
This boronia grows in woodland but is only known from a single population on an eroded hillside on private property near Gayndah in south-east Queensland.

Conservation
Boronia grimshawii is classed as "vulnerable" under the Queensland Government Nature Conservation Act 1992.