Seeds of South Australia
Olearia rudis (Compositae)
Purple Daisy-bush
List of species for Olearia
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Seed collecting:
October to November
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
IBRA regions
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]
RSCA map:
Regional Species Conservation Assessments per IBRA subregion. Please click the thumbnail map.
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Olearia]
Name derivation:
Latin 'olearius' pertaining to oil, from 'olea' olive and 'rudis' coarse, unformed, crude
In mallee and woodland communities often on red, calcareous sand
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.
Fruit type:
Achenes terete, 2-3 mm long, deeply striate, glabrous or subglabrous; pappus bristles 30-40, 5 mm long, subequal.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
BGA35800 (22.45 g)50+20-Oct-2010DJD1906
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:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
May-11100%33 d47 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions
May-1196%19 d33 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions
May-1169%47 d61 d
1% agar;
Incubated under spring/autumn conditions
May-1165%40 d61 d
1% agar with 100 mg/L potassium nitrate;
Incubated under spring/autumn conditions
May-1146%33 dNA
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions
May-1144%26 dNA
1% agar;
Incubated under winter conditions
May-1114%32 dNA 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)