Seeds of South Australia
Brachyscome gilesii (Compositae)
Giles Daisy
List of species for Brachyscome
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Seed collecting:
October to December
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Data Deficient   [outlier, grows on red sand]
Eyre Mallee (EYB05)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))
Torrens (GAW06) 
 Least Concern   [undercollected]
Roxby (GAW07) 
 Least Concern   [undercollected]
Commonwealth Hill (GAW08) 
 Least Concern
Maralinga (GVD03)Great Victoria Desert
 Least Concern
Kintore (GVD04) 
 Least Concern   [undercollected]
Tallaringa (GVD05) 
 Least Concern
Yellabinna (GVD06) 
 Least Concern
Nullarbor Plain (NUL02)Nullarbor
 Rare   (IUCN: RA d(i,ii))
Simpson Desert (SSD02)Simpson Strzelecki Dunefields
 Least Concern   [undercollected]
Dieri (SSD03) 
 Near Threatened   [edge of range]
Macumba (STP05)Stony Plains
 Least Concern   [undercollected]
Witjira (STP06) 
 Least Concern   [undercollected]
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern   [undercollected]
Watarru (CER02) 
 Least Concern
Everard Block (CER03) 
 Least Concern
Tieyon (FIN03)Finke
 Least Concern
Pedirka (FIN04) 
 Least Concern   [undercollected]
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockData Deficient
  [outlier, grows on red sand]
Eyre Mallee (EYB05)Eyre Yorke BlockRare
  (IUCN: RA d(i,ii))
7 of 8 subregionsGawlerLeast Concern
, Rare
4 of 4 subregionsGreat Victoria DesertLeast Concern
Nullarbor Plain (NUL02)NullarborRare
  (IUCN: RA d(i,ii))
2 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
, Near Threatened
2 of 7 subregionsStony PlainsLeast Concern
3 of 3 subregionsCentral RangesLeast Concern
2 of 2 subregionsFinkeLeast Concern
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. Gilesii named in honour of the explorer Ernest Giles (1835–1897), who collected plants for Ferdinand Mueller and was apparently the first to collect the species, having gathered it "Between the Alberga & Mt Olga" in 1873-1874, from Mount Eba in 1880 and near Mount Everard in 1882.
Distribution:
Widely distributed in arid regions of South Australia, from the N.T. border to as far south as northern Eyre Peninsula, growing in very open Acacia dominated shrubland or woodland on sand or sandy loam. Also found in the Northern Territory and a single specimen, from the Mulligan River area, recorded for Queensland.
Status:
Native. Common in South Australia. Very rare in Queensland. Common in Northern Territory.
Plant description:
Annual herb to 40 cm tall with ascending to erect stems and major branches to more than 30 cm long. Leaves with the first basal and near basal leaves and 1 or 2 uppermost leaves linear and entire but most leaves are lobed to 40 mm long and covered in glandular hairs. Flowers white, mauve, purple, pale purple and bluish-pink. Flowering between August and November.
Fruit type:
Brown daisy heads.
Seed type:
Brown ovoid to pyramid-shaped seed to 1 mm long and 0.5 mm wide, covered in 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 two collections, the seed viability were average to high, ranging from 555 to 085%.
Seed germination:
This species has physiological dormancy that needs to be overcome for the seed to germination.Gibberellic acid (250 mg/L added to water agar) can promote germination across all seasons, and potassium nitrate (100 mg/L added to water agar) can increase germination under summer conditions.  After-ripening at 45 degrees celcius for 2 - 6 months can release dormancy.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA24600 (2.448 g)9-Nov-2005MKJ121
Gairdner-Torrens
1-Aug-200755%-18°C
BGA12700 (1.2773 g)2-Nov-2005DJD167
Gairdner-Torrens
1-Aug-200785%-18°C
DJD15811-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 201091%7d7d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under summer conditions
July 201088%7d7d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under winter conditions
July 201081%7d7d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under spring/autumn conditions
July 201025%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)