Boronia angustisepala is a plant in the citrus family Rutaceae and is endemic to New South Wales, Australia. It is an erect shrub with many branches, pinnate leaves with up to eleven leaflets, and bright pink, four-petalled flowers.
Boronia angustisepala is an erect, many-branched shrub which grows to a height of 1.5sigfig=1NaNsigfig=1 with its young branches densely covered with star-shaped and woolly hairs. The leaves are pinnate, have between three and eleven leaflets and are NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide in outline with a petiole NaNsigfig=1NaNsigfig=1 long. The end leaflet is NaNsigfig=1NaNsigfig=1 long and NaNsigfig=1NaNsigfig=1 wide, the side leaflets usually shorter and narrower. Up to three bright pink flowers are arranged in leaf axils on a pedicel NaNsigfig=2NaNsigfig=2 long. The four sepals are narrow egg-shaped to narrow triangular, NaNsigfig=2NaNsigfig=2 long, NaNsigfig=2NaNsigfig=2 wide and hairy on their lower surface. The four petals are NaNsigfig=2NaNsigfig=2 long, NaNsigfig=2NaNsigfig=2 wide and enlarge slightly as the fruit develops. The eight stamens alternate in length with those near the sepals longer than those near the petals. Flowering occurs from July to November and the fruit are about 6sigfig=2NaNsigfig=2 long and 3sigfig=2NaNsigfig=2 wide with the remnants of the petals attached.[1] [2]
Boronia angustisepala was first formally described in 1999 by Marco F. Duretto and the description was published in the journal Muelleria from a specimen collected in the Gibraltar Range National Park.[3] The specific epithet (angustisepala) was derived from the Latin words Latin: angustus meaning "narrow" and Latin: sepala meaning "sepal", referring to the narrow sepals of this species.
This boronia grows in forest on sandstone or granite and is found in the Gibraltar Range National Park and the Bylong-Sandy Hollow-Denman area.