Seeds of South Australia
Brachyscome tatei (Compositae)
Nullarbor Daisy
List of species for Brachyscome
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Seed collecting:
January to December
Herbarium region:
Nullarbor
NRM region:
Alinytjara Wilurara
IBRA regions
Nullarbor Plain (NUL02)Nullarbor
 Rare   (IUCN: RA d(i,ii))
Hampton (HAM01)Hampton
 Rare   (IUCN: RA d(i,ii))
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. Tatei named after Ralph Tate (1840-1901), a geologist and the first Professor of Natural History at the University of Adelaide.
Distribution:
Found along the the limestone cliffs of the Great Australian Bight from Fowler's bay in South Australia to Eucla in Western Australia.
Status:
Native. Rare in South Australia. Rare in Western Australia.
Plant description:
A decumbent and branching perennial herb usually forming compact clumps with thick fleshy leaves. Flowers are white daisies displayed above the foliage. Flowering throughout the year.
Fruit type:
Brown daisy head to 1 cm across containing numerous brown seeds.
Seed type:
Flat ovoid brown seeds to 2 mm long and 1.3 mm wide, with few hairs and a serrated margin.
Embryo type:
Spatulate fully developed.
Seed collecting:
Pick heads that are maturing, drying off, with brown seeds that dislodge easily.
Seed cleaning:
Place the seed-heads in a tray and leave to dry for a week. Then gently rub the heads by hand 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 may have 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
BGA2300 (0.53 g)59-Sep-2008HPV3689
Nullarbor
Jun-201095%+5°C, -18°C
PJA1661-Jan-2012-18°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
August 201091%7d14d None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under winter conditions
August 201091%7d14d None.
1% water agar.
Incubated under winter conditions
August 201089%7d14d None.
1% water agar supplemented with 250mg/L GA3.
Incubated under winter conditions
August 201086%7d14d None.
1% water agar supplemented with 10% smoke water.
Incubated under winter conditions
January 200985%7d14d Surface sterilised with 1% NaOCl.
1% water agar.
Incubated under winter conditions
January 200983%7d14d None.
1% water agar.
Incubated under winter conditions
August 201080%7d14d None.
1% water agar.
Incubated under spring/autumn conditions
August 201080%7d14d None.
1% water agar supplemented with 250mg/L GA3.
Incubated under spring/autumn conditions
August 201077%7d28d None.
1% water agar supplemented with 250mg/L GA3.
Incubated under summer conditions
August 201075%7d14d None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under spring/autumn conditions
August 201069%7d28d None.
1% water agar.
Incubated under summer conditions
August 201055%7d35d None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under summer conditions
August 201053%7d42d None.
1% water agar supplemented with 10% smoke water.
Incubated under summer conditions
August 201050%7d49d None.
1% water agar supplemented with 10% smoke water.
Incubated under spring/autumn conditions
January 20096%21dNA None.
1% water agar supplemented with 250mg/L GA3.
Incubated under winter 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)