Boronia rubiginosa

A shrub to a height of 2 metres.

It is endemic to New South Wales, growing as far south as west of Berrima, with disjunct records up into Sydney and north-west Sydney (Wisemans Ferry to Kurrajong), then with gaps to Lithgow-Kandos area, north into Goulburn River National Park (Lees Pinch). There are also a few disjunct records in Mt Kaputar National Park (although these may be Boronia ruppii – see notes below).

It grows in dry sclerophyll shrubland, woodland and forest on skeletal sandstone-derived soils.

It has branchlets with stellate-rusty hairs.

Boronia spp. produce opposite leaves which can be simple or compound (sometimes on the same plant) and are usually aromatic (sometimes strongly-so).
In this species the leaves are compound-pinnate to about 50 mm long and to 35 mm, with 3 to 7 leaflets (to 30 mm long and to 12 mm wide), with the lower surface markedly paler, hairless to stellate-hairy.

Boronia have complete flowers (bisexual and with all whorls present). The flowers are produced either solitarily or in groups, in the leaf axils, or, at the branch terminals. There are usually four sepals, four petals and generally eight stamens, surrounding one female part (carpel). Flowers are often pink to purple, which makes them easily identifiable in NSW bushland.

In this species, flowers are arranged in leaf axils solitarily or in groups or 2 to 3, pale to bright pink and with woolly hairs, occurring from July to November.

The fruit of Boronia are described as a schizocarp-capsule; a capsule that splits into even segments, which each segment called a coccus. In this species, the capsules are glabrous, about 4 mm long and 2 mm wide.