Seeds of South Australia
Brachyscome rara (Compositae)
Rare Daisy
List of species for Brachyscome
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Seed collecting:
October to April
Herbarium region:
Lake Eyre
NRM region:
South Australian Arid Lands
IBRA region
Coongie (CHC06)Channel Country
 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. Rara from the Latin 'raris' meaning rare or uncommon; referring to the distribution of the species.
Distribution:
Found in the far north-east corner in South Australia, growing in the cracking clay of floodplains with mostly ephemeral herbs and grasses and chenopod shrubs. Also found in Queensland.
Status:
Native. Rare in South Australia. Rare in Queensland.
Plant description:
Annual herb to 40 cm high with ascending to erect hairless branches. Leaves above the base, entire but the margins sometimes appearing somewhat undulate. Basal leaves commonly oblanceolate or linearoblanceolate and tapering to the base to 50 mm long and 14 mm wide. Flowers white or pale mauve daisy appearing in spring to autumn, depending on seasonal conditions.
Fruit type:
Brown daisy heads.
Seed type:
Pale brown ovoid to pyramid-shaped seed to 1.5 mm long and 1 mm wide, spongy-looking and covered in wrinkles.
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 90%.
Seed germination:
This species may have physiological dormancy that needs to be overcome for the seed to germinate.Germinates quickest under spring/autumn conditions.  Requires an alternating day/night temperature, rather than static temperatures.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA10700 (1.67 g)100+26-Oct-2007DJD932
Lake Eyre
19-Sep-200895%-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 201088%14d42d None
1% w/v water agar
Incubated under spring/autumn conditions
July 201082%14d21d None
1% w/v water agar
Incubated under summer conditions
July 201063%21d35d None
1% w/v water agar
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)