Species of shrub
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Olearia asterotricha, commonly known as rough daisy-bush, is a species of flowering plant in the family Asteraceae. A tall shrub with white, mauve or blue daisy like flowers growing from the Blue Mountains in New South Wales to western Victoria, Australia.
Description.
"Olearia asterotricha" is small sprawling shrub to high and wide with an open habit. The branchlets are covered with densely matted woolly hairs, star-shaped hairs or a combination of both. It has white, pale mauve or blue daisy like flowers with a yellow or purplish centre. The flowers are in diameter and solitary or 25-40 per cluster and appear at the end of stems. Each inflorescence is on a peduncle about long. The bracts have fine short matted hairs and arranged in rows of 1-3. The dark green leaves are arranged alternately, sometimes with a very small stalk or without a stalk. The leaves are broadly-linear or oblong shaped, long and wide with rough star shaped hairs on the upper side of the leaves and stems. The underside of leaves is densely woolly, leaf margins are entire or toothed and rolled under. The fruit is cylindrical shape about long with 6-8 ribs about long. Fruit are smooth to sparsely covered with matted hairs. It contains a dry single seed that does not open on maturity.
Taxonomy and naming.
Rough daisy bush was first described in 1859 by Ferdinand von Mueller as "Eurybia asterotricha" and published in "Fragmenta Phytographiae Australiae". In 1865 Mueller changed the name to "Aster asterotrichus" and in 1867 English botanist George Bentham changed the name to "Olearia asterotricha" in "Flora Australiensis". The specific epithet ("asterotricha") is derived from the ancient Greek words "aster" meaning "a star" and "thrix, trichos" meaning "hair".
In 2014, Andre Messina described four subspecies in "Australian Systematic Botany" and the names are accepted at the Australian Plant Census: 
Distribution and habitat.
Rough daisy bush grows from the Blue Mountains, New South Wales to western Victoria where it grows mostly in cool damp acidic soils, heath, or dry sclerophyll forest. The species may vary depending on geographic region. In the Sydney region it is a compact shrub with white flowers and grey-green foliage. The Victorian form has mauve-blue flowers, green leaves and a more open form. Considered rare in Victoria.
References.
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