Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
Display IBRA region text
| Olary Spur (FLB03) | Flinders Lofty Block | Data Deficient [Edge of range] |
| Southern Flinders (FLB04) | | Least Concern |
| Northern Flinders (FLB05) | | Rare (IUCN: RA d(i,ii)) [can be confused with other spp] |
| Central Flinders (FLB06) | | Rare (IUCN: RA d(i,ii)) (Probable Decline) [habitat degraded; grows red loamy soils] |
Etymology
Brachyscome from the Greek 'brachys' meaning short and 'kome' meaning hair; referring to tuft of short bristles or hairs of the pappus. Dichromosomatic meaning having two chromosomes.
Distribution and status
Endemic to South Australia and found in the Flinders Ranges and Lake Torrens region, growing saltbush, arid low shrubland and on rocky outcrops. Native. Common in South Australia.
Herbarium regions: Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eyre Peninsula
NRM regions: Eyre Peninsula, Northern and Yorke, South Australian Arid Lands
AVH map: SA distribution map (external link)
Plant description
Annual herb to 25 cm high. Leaves basal and near-basal, not forming a rosette, pinnatisect with 5-9 linear obtuse segments, 3-8 cm long, glabrous. Yellow daisy flower appearing in June to September. Brachyscome dichromosomatica var. dichromosomatica differ from B. dichromosomatica var. alba by having pale blue or mauve ray corolla, at least on the under surface (white ray corolla in B. dichromosomatica var. alba). Fruits are dense brown daisy-heads. Seeds are brown-black wedge-shaped seed 3 mm long and 1 mm wide, with dense long white hairs along the margin. Seed embryo type is spatulate fully developed.
Seed collection and propagation
Collect seeds between August and December. Pick heads that are maturing, drying off, with brown seeds. Place the seed-heads in a tray and leave to dry for a week. Then gently rub the heads with a rubber bung 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. From one collection, the seed viability was high, at 100%. This species has physiological dormancy that need to be overcome for the seed to germinate.
| Location | No. of seeds
(weight grams) | Number
of plants | Date
collected | Collection number
Collection location | Date
stored | % Viability | Storage
temperature | | BGA | 18,000 (12.58 g) | 100+ | 23-Nov-2010 | KHB530
Flinders Ranges | 1-Jan-2012 | 100% | -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:
Display
| Date | Result | T0 | T50 | Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod |
| May-11 | 100% | 13 | 20 |
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions |
| May-11 | 100% | 13 | 20 |
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions |
| May-11 | 100% | 13 | 20 |
1% agar;
Incubated under winter conditions |
| May-11 | 34% | 13 | NA |
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions |
| May-11 | 30% | 13 | NA |
1% agar;
Incubated under spring/autumn conditions |
| May-11 | 25% | 13 | NA |
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)
