Plants of
South Australia
Olearia pannosa ssp. pannosa
Compositae
Silver Daisy-bush
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Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
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Botanical art

Kath Alcock painting: 1.

Etymology

Olearia named after Johann Gottfried Ölschläger (1603-1671), 17th century German horticulturist and author of a flora of Halle in Germany (his name was latinized to Olearius). Alternatively, it maybe from the Latin 'olearius' pertaining to oil, from 'olea', for olive tree; alluding to the first named species resembling the olive.

Distribution and status

Endemic to South Australia and found scattered in the southern part using on road sides and with few individuals. Native. Rare in South Australia.
Herbarium regions: Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions: Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
AVH map: SA distribution map (external link)

Plant description

Spreading undershrub or shrub to 1.5m high, producing root suckers. Stems woody at least at the base, branched with appressed hairs. Leaves with petioles to 15mm long, broad-ovate to elliptic, acute to shallowly cordate at the base, acute to obtuse at the apex, to 9cm long and 5cm wide, prominently reticulate-veined, dark green and shiny above and white- to rusty-tomentose below with margins flat. Flower head solitary, terminal and in the upper leaf axils, on long stalk to 30cm long often with 1 or 2 reduced leaves. Flowers large, white rarely pale-mauve daisy with a yellow centre. Fruits are large fluffy daisy heads containing numerous seeds. Seeds are striated, semi-flat, brown to dark red achenes to 8mm long and 2mm wide covered in white hairs and with a pale yellow pappus bristles to 10mm long. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between October and December. Collect heads that are large and fluffy. Either pick off the whole heads or use your finger and pull off the seeds from the head. Mature seeds will come off easily. Place the heads in a tray for a week to dry. No cleaning is required if only pure seeds are collected. If heads are collected, then rub the heads gently with your hands to dislodge the seeds. Viable seeds will be fat and hard. Store the seeds with a desiccant such as dried silica beads or dry rice, in an air tight container in a cool and dry place. From twelve collections, the seed viability were low to average, ranging from 15% to 70%. Seeds can be heavily predated. Viable seeds should be fat, hard and a dark red brown colour. Seeds are non-dormant, viable seed should germinate readily.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA2,250 (14.5 g)4018-Nov-2004DJD37
Southern Lofty
31-Mar-2006N/C-18°C
BGA 
MSB
1,400 (9 g)
1,400 (9 g)
401-Dec-2004DJD56
South Eastern
31-Mar-200670%-18°C
BGA1,650 (10.67 g)301-Dec-2004DJD55
South Eastern
31-Mar-2006N/C-18°C
BGA5,500 (28.88 g)23-Nov-2005CSO2
Murray
14-Sep-200665%+5°C, -18°C
BGA3,600 (15.88 g)6-Dec-2005CSO3
Southern Lofty
14-Sep-200630%+5°C, -18°C
BGA11,900 (50.1 g)30+30-Dec-2005KHB33
Flinders Ranges
14-Sep-200615%+5°C, -18°C
BGA4,000 (12.91 g)6-Dec-2005CSO1
Southern Lofty
14-Sep-200615%+5°C, -18°C
BGA1,600 (8.31 g)12-Dec-2005TJ3
Yorke Peninsula
14-Sep-200615%+5°C, -18°C
BGA2,800 (10.85 g)18-Oct-2006DJD572
Yorke Peninsula
1-Aug-200765%+5°C, -18°C
BGA1,100 (3.06 g)418-Oct-2006DJD602
Yorke Peninsula
1-Aug-200715%-18°C
BGA5,000 (22.42 g)317-Oct-2006DJD595
Yorke Peninsula
1-Aug-200745%+5°C, -18°C
BGA6,300 (24.25 g)25-Nov-2010DJD2054
Southern Lofty
1-Nov-201234%-18°C
BGA4,700 (14.7 g)14-Nov-2008T.Jury
Yorke Peninsula
1-Jan-201640%-18°C
BGA19,600 (69.6 g)30+12-Nov-2015DJD3249
Southern Lofty
2-May-201755%+5°C, -18°C, -80°C
BGA19,000 (75.41 g)824-Oct-2018DJD3804
Yorke Peninsula
24-Apr-20195%-18°C
Location: BGA — the seeds are stored at the Adelaide Botanic Gardens, MSB — the seeds are stored at the Millennium Seed Bank, Kew, England.
Number of plants: This is the number of plants from which the seeds were collected.
Collection location: The Herbarium of South Australia's region name.
% Viability: Percentage of filled healthy seeds determined by a cut test or x-ray.
Germination table:
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