Brachyscome tatei

Asteraceae

Nullarbor Daisy,

Tate's Daisy

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plant: Brachyscome tatei Nullarbor Cliffs plant

plant: Brachyscome tatei plant habit 4 c

plant: Brachyscome tatei and habit plant 5

flower: Brachyscome tatei and flower plant 3

flower: Brachyscome tatei Nullarbor Cliffs flower

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

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Botanical art

Kath Alcock paintings: 2

Prior names

Brachycome tatei

Common names

Nullarbor Daisy

Tate's Daisy

Etymology

Brachyscome from the Greek 'brachys' meaning short and 'kome' meaning hair, referring to the tuft of short bristles or hairs of the pappus. Tatei named after Ralph Tate (1840-1901), a geologist and the first Professor of Natural History at the University of Adelaide.

Distribution and status

Found along the the limestone cliffs of the Great Australian Bight from Fowler's bay in South Australia to Eucla in Western Australia. Native. Rare in South Australia. Rare in Western Australia.
Herbarium region: Nullarbor
NRM region: Alinytjara Wilurara
AVH map: SA distribution map (external link)

Plant description

A decumbent and branching perennial herb usually forming compact clumps with thick fleshy leaves. Flowers are white daisies displayed above the foliage. Flowering throughout the year. Fruits are brown daisy-head to 1 cm across containing numerous brown seeds. Seeds are flat ovoid brown seeds to 2 mm long and 1.3 mm wide, with few hairs and a serrated margin. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between January and December. Pick heads that are maturing, drying off, with brown seeds that dislodge easily. 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. From one collection, the seed viability was high, at 95%. This species may have physiological dormancy that needs to be overcome for the seed to germinate.

Seeds stored:

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Location	No. of seeds (weight grams)	Number of plants	Date collected	Collection number Collection location	Date stored	% Viability	Storage temperature
BGA	2,300 (0.53 g)	5	9-Sep-2008	HPV3689 Nullarbor	1-Jun-2010	95%	+5°C, -18°C
BGA MSB	3,600 (0.46 g) 2,200 (0.3 g)		20-Dec-2007	PJA166 Nullarbor	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:

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Date	Result	T0	T50	Pre-treatment \| Germination medium \| Incubator: Photoperiod / Thermoperiod
Aug-10	91%	7	14	1% agar with 100 mg/L potassium nitrate; Incubated under winter conditions
Aug-10	91%	7	14	1% agar; Incubated under winter conditions
Aug-10	89%	7	14	1% agar with 250 mg/L gibberellic acid; Incubated under winter conditions
Aug-10	86%	7	14	1% agar with 10% smoke water; Incubated under winter conditions
Jan-09	83%	7	14	1% agar; Incubated under winter conditions
Aug-10	80%	7	14	1% agar with 250 mg/L gibberellic acid; Incubated under spring/autumn conditions
Aug-10	80%	7	14	1% agar; Incubated under spring/autumn conditions
Aug-10	77%	7	28	1% agar with 250 mg/L gibberellic acid; Incubated under summer conditions
Aug-10	75%	7	14	1% agar with 100 mg/L potassium nitrate; Incubated under spring/autumn conditions
Aug-10	69%	7	28	1% agar; Incubated under summer conditions
Aug-10	55%	7	35	1% agar with 100 mg/L potassium nitrate; Incubated under summer conditions
Aug-10	53%	7	42	1% agar with 10% smoke water; Incubated under summer conditions
Aug-10	50%	7	49	1% agar with 10% smoke water; Incubated under spring/autumn conditions
Jan-09	6%	21	NA	1% agar with 250 mg/L gibberellic acid; 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)

Nullarbor Plain (NUL02)	Nullarbor	Rare (IUCN: RA d(i,ii))
Hampton (HAM01)	Hampton	Rare (IUCN: RA d(i,ii))