Boronia pinnata

Boronia pinnata is an erect, woody shrub that typically grows to a height of about 1.5 m (4.9 ft) and is glabrous, apart from the flowers. The leaves are pinnate with up to thirteen narrow elliptic to narrow oblong leaflets. The entire leaf is 18–60 mm (0.71–2.36 in) long and 14–54 mm (0.55–2.13 in) wide in outline and the leaflets are mostly 5–29 mm (0.20–1.14 in) long and 1–3 mm (0.039–0.118 in) wide on a petiole 6–17 mm (0.24–0.67 in) long. Between three and twenty, sometimes as many as forty flowers are arranged in groups in the leaf axils. The groups are on a peduncle 5–20 mm (0.20–0.79 in) long, the individual flowers on a pedicel 6–30 mm (0.24–1.18 in) long. The four sepals are triangular, 1–1.5 mm (0.039–0.059 in) long and about 1 mm (0.039 in) wide. The four petals are bright pink, 5–11.5 mm (0.20–0.45 in) long with a few hairs on the back. The eight stamens have hairy edges. Flowering occurs from September to January and the fruit is a glabrous capsule 4–5 mm (0.16–0.20 in) long.[2][3][4]

Boronia pinnata was first formally described in 1798 by James Edward Smith who published the description in his book ''Tracts relating to natural history.[5][6] The specific epithet (pinnata) is a Latin word meaning "feathered" or "plumed".[7] This was the only pinnate-leaved species of boronia described by Smith.[2]

This boronia grows in dry forest and heath on sandstone in near-coastal areas between the Nowra district and Ballina.[3][4]

One of the easier boronias to grow in gardens, B. pinnata does best in a sheltered position with rocks aiding a shallow root run and it benefits from light pruning.[8]