Boronia is a genus of about 160 species of flowering plants in the citrus family Rutaceae. Most are endemic to Australia with a few species in New Caledonia, which were previously placed in the genus Boronella. They occur in all Australian states but the genus is under review and a number of species are yet to be described or have the description published. Boronias are similar to familiar plants in the genera Zieria, Eriostemon and Correa but can be distinguished from them by the number of petals or stamens. Some species have a distinctive fragrance and are popular garden plants.
Zieria smithii, commonly known as sandfly zieria, lanoline bush or Smithian zieria, is a plant in the citrus family Rutaceae and is endemic to eastern and south-eastern Australia. It is a robust shrub with its leaves composed of three leaflets, and groups of flowers with four white petals, the groups usually shorter than the leaves. It is common and widespread along the coast and adjacent ranges.
Zieria citriodora, commonly known as lemon-scented zieria, is a species of flowering plant in the citrus family Rutaceae and is endemic to a small area near the border between New South Wales and Victoria. It is a small shrub with lemon-scented leaves and small, pale pink or white flowers which appear from late winter to summer.
Zieria aspalathoides, commonly known as the whorled zieria, heath zieria, hairy zieria or heathy zieria, is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is a heath-like shrub with leaves that appear to be whorled and with pink flowers in groups of three, each with four petals and four stamens.
Zieria laevigata commonly known as smooth zieria, smooth-leaved zieria or twiggy midge bush is a species of flowering plant in the citrus family Rutaceae and is endemic to eastern Australia. It is an erect shrub with smooth, three-part leaves and pale pink or white flowers with four petals and four stamens. It grows in poor soil on rocky outcrops and flowers from late winter to spring.
Zieria arborescens, commonly known as the tree zieria or stinkwood, is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is a bushy shrub or small tree with branches that are ridged and scaly or hairy, at least when young. It has leaves composed of three leaflets and groups of flowers with four white petals, the groups usually shorter than the leaves.
Zieria minutiflora, commonly known as twiggy zieria, is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is a small, erect, twiggy shrub with leaves composed of three leaflets, and clusters of small white flowers with four petals and four stamens. It usually grows as an understorey shrub in eucalypt woodland.
Zieria alata is a plant in the citrus family Rutaceae and is only found on mountains in the Mossman and Daintree areas in Queensland. It is an open shrub with wiry, lumpy branches, three-part leaves and small, white, cream-coloured or pale pink flowers in small groups, each with four petals and four stamens.
Zieria fraseri is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is a dense, bushy shrub with leaves composed of three leaflets, and white flowers with four petals and four stamens. It usually grows in rocky places on steep hills.
Zieria graniticola is a plant in the citrus family Rutaceae and is a dense, compact shrub with erect wiry branches, three-part leaves and pale pink flowers in groups of up to three, each with four petals and four stamens. It is only known from two population near Stanthorpe in Queensland, Australia.
Zieria hydroscopica is a plant in the citrus family Rutaceae and is only known from a single state forest near Monto in Queensland. It is a small shrub with erect, wiry branches, three-part leaves and groups of large numbers of flowers, the groups smaller than the leaves and the flowers with four petals and four stamens. It is similar to Zieria smithii, differing only in the type of hairs on the branches and lower surface of the leaves.
Zieria ingramii, commonly known as Keith's zieria, is a plant in the citrus family Rutaceae and is endemic to a small area in central New South Wales. It is a slender, spindly, aromatic shrub with three-part, clover-like leaves and clusters of about seven white to pale pink flowers with four petals and four stamens. The species is only known from two state forests near Dubbo.
Zieria laxiflora, commonly known as wallum zieria, is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is an erect shrub with leaves composed of three leaflets, and clusters of about nine white or pale pink flowers with four petals and four stamens. It usually grows is coastal heathland.
Zieria obovata is a plant in the citrus family Rutaceae and is endemic to Queensland. It is a small, open shrub with leaves composed of three leaflets, and with up to three cream-coloured to pale pink flowers with four petals and four stamens. It usually grows on steep, rocky slopes in wet open forest.
Zieria odorifera, commonly known as the fragrant zieria, is a plant in the citrus family Rutaceae and is endemic to inland New South Wales. It is an aromatic shrub with ridged branches, leaves composed of three leaflets and groups of mostly three pale to deep pink, four-petalled flowers in spring.
Zieria southwellii is a plant in the citrus family Rutaceae and is endemic to eastern Australia. It is a large shrub or small tree with its leaves composed of three leaflets, and has groups of large numbers of flowers with four white petals, the groups shorter than the leaves. It grows near rainforest in northern New South Wales and far south-eastern Queensland.
Zieria tenuis is a plant in the citrus family Rutaceae and endemic to the northern inland of Queensland. It is an open, straggly shrub with wiry branches, three-part leaves and groups of nine to twelve flowers with four white or pinkish petals and four stamens. It is similar to Z. collina but has larger petals, and to Z. cytisoides which has different leaf venation and differently shaped leaflets.
Marco Duretto is a manager and senior research scientist at the Royal Botanic Gardens Sydney in Australia.
Zanthoxyloideae is a subfamily of the family Rutaceae.
