Seeds of South Australia
Brachyscome muelleri (Compositae)
Corunna Daisy
List of species for Brachyscome
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Seed collecting:
September to December
Herbarium region:
Eyre Peninsula
NRM region:
South Australian Arid Lands
IBRA region
Myall Plains (GAW01)Gawler
 Critically Endangered   (IUCN: CR C1+2a(i,ii))   (Definite Decline)   [needs winter rainfall]
Gawler Volcanics (GAW02) 
 Critically Endangered   (IUCN: CR C1+2a(i,ii))   (Definite Decline)   [needs winter rainfall]
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 Brachyscome]
Name derivation:
Brachyscome from the Greek 'brachys' meaning short and 'kome 'meaning hair; referring to the short bristles or hairs of the pappus. Muelleri named in honour of Ferdinand von Mueller (1825-1896), botanist, plant collector and Government Botanist of Victoria.
Distribution:
Endemic to South Australia and known only from one location at Baxter Hills near Iron Knob, growing in loam on moist, shaded cliff slopes. The type specimen was collected by Ferdinand Mueller in 1851 near the Para River in the vicinity of Gawler with another collection gathered from Paskeville by Ernest Beythein.
Status:
Native. Very rare in South Australia.
Plant description:
An annual herb to 20 cm high with hair-less flowering stems arising from a basal rosette of leaves. Basal leaves are deeply serrated. Flowers are white daisies appearing between August and September.
Fruit type:
Small brown-black daisy heads with numerous exposed seeds.
Seed type:
Small black convex seed to 1.5 mm long and 1 mm wide.
Embryo type:
Spatulate fully developed.
Seed collecting:
Pick mature seed-heads by hand, when seeds have turned black.
Seed cleaning:
Place the heads in a tray and leave to dry for a week. Then rub the heads gently with your hands to dislodge the seeds. Use a sieve to separate the unwanted material. 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.
Seed viability:
From one collection, the seed viability was high, at 95%.
Seed germination:
This species has physiological dormancy that needs to be overcome for the seed to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
14800 (2 g)
3600 (0.55 g)
16-Sep-2006PJA99
Eyre Peninsula
1-Aug-200795%+5°C, -18°C
Corunna 20091-Jan-2012-18°C
BGA13240 (1.7848 g)200+28-Sep-2010PJA203
Eyre Peninsula
1-Jan-2012+5°C, -18°C
nursery collected seed1-Jan-2012-18°C
BGA 
MSB
14800 (2 g)
3600 (0.55 g)
100+16-Sep-2005PJA99
Eyre Peninsula
95%-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:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Aug-1041%14 dNA
1% agar with 10% smoke water;
Incubated under winter conditions
Aug-1040%14 dNA
1% agar;
Incubated under winter conditions
Aug-1038%14 dNA
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions
Aug-1033%7 dNA
1% agar with 250 mg/L gibberellic acid;
Incubated under spring/autumn conditions
Aug-1033%7 dNA
1% agar with 250 mg/L gibberellic acid;
Incubated under summer conditions
Aug-1030%7 dNA
1% agar with 250 mg/L gibberellic acid;
Incubated under winter conditions
Aug-1026%7 dNA
1% agar with 100 mg/L potassium nitrate;
Incubated under spring/autumn conditions
Aug-1022%7 dNA
1% agar with 10% smoke water;
Incubated under spring/autumn conditions
Aug-1018%7 dNA
1% agar;
Incubated under spring/autumn conditions
Aug-1014%7 dNA
1% agar with 100 mg/L potassium nitrate;
Incubated under summer conditions
Jan-097%35 dNA
1% agar with 250 mg/L gibberellic acid;
Incubated under winter conditions
Jan-097%14 dNA
1% agar;
Incubated under winter conditions
Aug-106%7 dNA
1% agar;
Incubated under summer conditions
Aug-102%7 dNA
1% agar with 10% smoke water;
Incubated under summer 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)