Purple Daisy-bush,
Azure 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
Display IBRA region text
| Kangaroo Island (KAN01) | Kanmantoo | Least Concern |
| Southern Yorke (EYB01) | Eyre Yorke Block | Near Threatened (Probable Decline) |
| Eyre Hills (EYB03) | | Rare (IUCN: RA d(i,ii)) |
| Talia (EYB04) | | Rare (IUCN: RA d(i,ii)) |
| Eyre Mallee (EYB05) | | Least Concern [could be records missing] |
| Murray Mallee (MDD02) | Murray Darling Depression | Rare (IUCN: RA ab) (Probable Decline) [short lived; fire regenerated] |
| Murray Lakes and Coorong (MDD03) | | Regionally Extinct [presumed extinct] |
| Lowan Mallee (MDD04) | | Near Threatened [in Billiatt CP; short-lived, fire related] |
Botanical art
Kath Alcock paintings: 2
Prior names
Olearia rudis var. glabriuscula
Eurybia scabra
Eurybia rudis
Aster exul
Common names
Purple Daisy-bush
Azure Daisy-bush
Etymology
Latin 'olearius' pertaining to oil, from 'olea' olive and 'rudis' coarse, unformed, crude
Distribution and status
In mallee and woodland communities often on red, calcareous sand Native
Herbarium regions: Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island
NRM regions: Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)
Plant description
Shrub or undershrub, to 1.3 m high. Leaves alternate, crowded; lamina elliptic, obovate or ovate, 15�120 mm long, 6�40 mm wide, scabrous to glabrous, green. Capitula terminal, solitary or compound corymbs of 2-8, 20�40 mm wide. Ray florets 39�75, pale blue or mauve or purple, disc florets 86�241, orange. Flowering June - October. Fruits are achenes terete, 2-3 mm long, deeply striate, glabrous or subglabrous; pappus bristles 30-40, 5 mm long, subequal.
Seed collection and propagation
Collect seeds between October and November.
| Location | No. of seeds
(weight grams) | Number
of plants | Date
collected | Collection number
Collection location | Date
stored | % Viability | Storage
temperature |
MSB |
3,400 (1.96 g) | 12 | 17-Oct-2006 | DJD591
Yorke Peninsula | | | |
| BGA | 35,800 (22.45 g) | 50+ | 20-Oct-2010 | DJD1906
Murray | 1-Jan-2012 | 100% | -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:
Display
| Date | Result | T0 | T50 | Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod |
| May-11 | 100% | 33 | 47 |
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions |
| May-11 | 96% | 19 | 33 |
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions |
| May-11 | 69% | 47 | 61 |
1% agar;
Incubated under spring/autumn conditions |
| May-11 | 65% | 40 | 61 |
1% agar with 100 mg/L potassium nitrate;
Incubated under spring/autumn conditions |
| May-11 | 46% | 33 | NA |
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions |
| May-11 | 44% | 26 | NA |
1% agar;
Incubated under winter conditions |
| May-11 | 14% | 32 | NA |
humidity chamber 40% RH 10 months (dark, summer);
1% agar;
Incubated under spring/autumn conditions |
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)
