Seeds of South Australia
Olearia picridifolia (Compositae)
Rasp Daisy-bush
List of species for Olearia
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Herbarium regions:
Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South East
IBRA regions
Tintinara (NCP04)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [needs frequent burning]
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [Finnis River & Monarto; edge of range; not often seen]
Broughton (FLB02)Flinders Lofty Block
 Endangered   (IUCN: EN D)   (Probable Decline)
Olary Spur (FLB03) 
 Endangered   (IUCN: EN D)   (Probable Decline)
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN D)   (Probable Decline)
Central Flinders (FLB06) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D1+2)   (Probable Decline)   [grazed, trampled]
St Vincent (EYB02)Eyre Yorke Block
 Endangered   (IUCN: EN D)   (Probable Decline)
Talia (EYB04) 
 Rare   (IUCN: RA d(ii))
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i))   (Probable Decline)   [require fire to regenerate; persistent, long-lived spp]
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU B2ab(ii,iii); D2)   (Probable Decline)   [needs frequent burning]
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [require fire to regenerate; persistent, long-lived spp]
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
Distribution:
Found mainly in mallee and heath on alkaline soils derived from limestone or dunes.
Status:
Rare
Plant description:
Shrub or undershrub up to 1 m high.  Leaves sessile, narrowly oblanceolate, acute, attenuate at the base, 2-5 cm long, 2-8 mm wide, grey-green, densely hirsute, with a prominent mid-vein. Capitula solitary or in corymbs of 2-8, on hirsute peduncles 2-10 cm long. Ray florets 15-30; ligules linear, 10-15 mm long, white to blue or violet; disk florets 30-50, yellow. Flowering June - October.
Fruit type:
Achenes terete, 2-3 mm long, striate, glabrous; pappus bristles 25-40, in 2 unequal series, the longer ones 4-5 mm long.
Seed collecting:
Cut off mature fruiting heads and place in a warm place to dry.
Seed cleaning:
Separate seed from fruit head, remove any unwanted material.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA3100 (1.38 g)15+22-Nov-2009KHB315
Flinders Ranges
Jun-2010100%+5°C, -18°C
BGA680 (0.28 g)32-Nov-2010DJD1904
Murray
1-Jan-2012100%
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%6 d20 d
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions
May-11100%6 d20 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions
May-11100%6 d13 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions
May-11100%6 d13 d humidity chamber 40% RH 10 months (dark, summer);
1% agar;
Incubated under winter conditions
May-11100%13 d20 d
1% agar;
Incubated under winter conditions
May-1194%13 d20 d
1% agar;
Incubated under spring/autumn conditions
May-1192%6 d20 d
1% agar with 100 mg/L potassium nitrate;
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)