Seeds of South Australia
Brachyscome exilis (Compositae)
Finger-leaved Daisy
List of species for Brachyscome
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Seed collecting:
October to January
Herbarium regions:
Gairdner-Torrens, Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Glenelg Plain (NCP02) 
 Vulnerable   (IUCN: VU D2)   [no records, not yet databased]
Lucindale (NCP03) 
 Near Threatened
Tintinara (NCP04) 
 Vulnerable   (IUCN: VU D2)
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(i,ii))   [very tiny; undercollected]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [very tiny; undercollected]
Broughton (FLB02) 
 Data Deficient
Olary Spur (FLB03) 
 Data Deficient
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Data Deficient
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(i,ii))
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [edge of range; annual]
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU B2ab(ii,iii))   (Probable Decline)
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))
Yellabinna (GVD06)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))
IBRA regions
DISPLAY ALL
4 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Near Threatened
, Vulnerable
2 of 2 subregionsKanmantooRare
3 of 6 subregionsFlinders Lofty BlockVulnerable
, Data Deficient
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
, Data Deficient
2 of 6 subregionsMurray Darling DepressionRare
, Vulnerable
2 of 8 subregionsGawlerRare
Yellabinna (GVD06)Great Victoria DesertRare
  (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. Exilis from the Latin 'exile' meaning thin, slender, feeble; alluding to its wiry appearance.
Distribution:
Found in the southern part of South Australia from the Eyre Peninsula to the lower South-east, growing on red sandy soil in bluebush, and saline flats. Also found in Western Australia, New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Annual herb to 18 cm high with erect to ascending, weak, slender, hairless stems. Basal leaves oblanceolate, entire to lobed, to 4 cm long and 8 mm wide, narrowed at the base, hairless. Upper leaves entire to lobed, broad to 2 cm long and 5 mm wide. Flowers white appearing between August and November.
Fruit type:
Small brown daisy heads.
Seed type:
Pale brown 4-angled seed to 1.5 mm long and 0.5 mm wide, with short scattered hairs.
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 four collections, the seed viability were low to high, ranging from 10% to 98%.
Seed germination:
This species has physiological dormancy that needs to be overcome for the seed to germinate. Daily fluctuating temperatures representing spring, summer or winter stimulate germination.  Constant temperatures are not as good for germination.  Gibberellic acid and potassium nitrate can increase germination rates.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
10500 (3.18 g)
10500 (3.18 g)
25-Oct-2005DJD155
Murray
1-Aug-200710%-18°C
BGA1320 (0.3143 g)1-Jan-2007PJA140B
South Eastern
1-Aug-200725%-18°C
BGA5700 (1.33 g)50+7-Dec-2006PJA140
South Eastern
1-Aug-200725%-18°C
DJD16101-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
July 201066%7d21d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under winter conditions
July 201065%7d28d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under summer conditions
July 201061%7d28d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under spring/autumn conditions
July 201015%7dNA None
1% w/v water 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)