Species of flowering plant
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Olearia rugosa, commonly known as wrinkled daisy-bush, is a species of flowering plant in the family Asteraceae. It has alternate, wrinkled leaves and white daisy-like flowers and is endemic to south-eastern Australia.
Description.
"Olearia rugosa" is sometimes a spindly shrub to high with branchlets densely covered in star-shaped, short matted hairs. The leaves are arranged alternately, almost sessile or with a petiole, broadly elliptic, oblong or egg-shaped, long, usually wide, green on the upper surface, veined, wrinkled, warty, some with finer occasional star-shaped hairs and densely covered in grey-brown, soft hairs on the under surface. The leaf margins are broadly toothed to scalloped, flat or curved under, rarely smooth. The flower head is in diameter, borne in upper leaf axils or at the end of branches singly or in corymbs on a peduncle long. The white flowers are in groups of 8-13, ligules long, centres yellow or purplish. The bracts toothed, margins sometimes purple coloured, densely covered with short, matted, star-shaped hairs or only near the apex. The dry fruit is cylindrical, one-seeded, ribbed, long, smooth or with a moderate covering of silky hairs.
Taxonomy and naming.
This species was first formally described in 1861 by William Archer who gave it the name "Eurybia rugosa" in the "Journal of the Proceedings of the Linnean Society, Botany", from an unpublished description by Ferdinand von Mueller. In 1917 John Hutchinson changed the name to "Olearia rugosa" in The Gardeners' Chronicle. The specific epithet ("rugosa") means "wrinkled".
In 2013, five subspecies of "O. rugosa" were described in "Australian Systematic Botany" and the names are accepted by the Australian Plant Census:
† The type specimens of "O. allenderae" were collected by Marie Allender.
Distribution and habitat.
Subspecies "allenderae" grows in swampy areas or on gully slopes in forest and is restricted to Wilsons Promontory National Park and subsp. "angustifolia" usually grows in streams or swamps in near-coastal areas of East Gippsland in Victoria. Subspecies "distaliloba" grows in mountain forest, often in gullies and depressions, from far south-eastern New South Wales and east of the Snowy River in Victoria. Subspecies "intermedia" is restricted to some Bass Strait Islands and north-eastern Tasmania and subsp. "rugosa" is found in moist forests, mostly on the Great Dividing Range between Mount Macedon and Drouin in central southern Victoria.
Conservation status.
Subspecies "allenderae" is listed as "endangered" under the Victorian Government "Flora and Fauna Guarantee Act 1988".
References.
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