Seeds of South Australia
Brachyscome dentata (Compositae)
Toothed Daisy
List of species for Brachyscome
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Seed collecting:
June, October to February
Herbarium regions:
Lake Eyre, Flinders Ranges, Eastern, Northern Lofty, Murray, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Fleurieu (KAN02)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [southern edge of range, Monarto area]
Olary Spur (FLB03)Flinders Lofty Block
 Data Deficient
Northern Flinders (FLB05) 
 Least Concern
Murray Scroll Belt (RIV06)Riverina
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [should have state rating]
Bimbowrie (BHC05)Broken Hill Complex
 Data Deficient
Curnamona (BHC06) 
 Data Deficient
Murnpeowie (STP03)Stony Plains
 Near Threatened
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. Dentata from the Latin 'dens' meaning tooth; referring to the tooth-like margin of the seed.
Distribution:
Found on the eastern side of South Australia, from Strzeleski to Murray Bridge, growing in heavy clay flood plains, sand plains and grassland. Also found in Queensland, New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Perennial herb to 50 cm high with a woody rootstock. Leaves are extremely variable in shape, usually linear to wedge-shaped with 3 teeth at he tip but can have up to 13 teeth around the margin. Large white daisy appearing between June and November.
Fruit type:
Brown daisy heads.
Seed type:
Flat yellow seed to 3 mm long and 2 mm wide, with deeply tooth winged margin, tubercule face and  short pappus at one end.
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 three collections, the seed viability were high, ranging from 85% to 100%.
Seed germination:
This species may have physiological dormancy that needs to be overcome for the seed to germinate.Winter produces high germination.  Potassium nitrate, smoked water, and gibberellic acid can improve germination..
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
22500 (6.4 g)
22500 (6.4 g)
100+22-Oct-2008MJT161
Eastern
Jun-201090%-18°C
DJD10811-Jan-2012-18°C
BGA13000 (4.95 g)50+15-Jun-2010KHB424
Flinders Ranges
1-Jan-201285%-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 201089%7d14d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under winter conditions
July 201070%7d14d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under spring/autumn conditions
July 201068%7d14d None
1% w/v water agar
Incubated under winter conditions
July 201055%7d35d None
1% w/v water agar supplemented with 250 mg/L gibberellic acid
Incubated under summer 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)