Olearia rudis

Asteraceae

Purple Daisy-bush,

Azure Daisy-bush

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plant: Olearia rudis white flowers Billiat CP1

plant: Olearia rudis lf Denzel Murfet Black Point

plant: Olearia rudis lf under Denzel Murfet Black Point

flower: Olearia rudis f Denzel Murfet Black Point

Bombyliidae on Olearia rudis, Dudley Peninsula - Colin Wilson

animal: Olearia rudis animal Denzel Murfet KI

seed: Olearia rudis DJD1906 seed closeup

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

Olearia rudis var. glabriuscula

Eurybia scabra

Eurybia rudis

Aster exul

Common names

Purple Daisy-bush

Azure Daisy-bush

Etymology

Latin 'olearius' pertaining to oil, from 'olea' olive and 'rudis' coarse, unformed, crude

Distribution and status

In mallee and woodland communities often on red, calcareous sand Native
Herbarium regions: Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island
AVH map: SA distribution map (external link)

Plant description

Shrub or undershrub, to 1.3 m high. Leaves alternate, crowded; lamina elliptic, obovate or ovate, 15ï¿½120 mm long, 6ï¿½40 mm wide, scabrous to glabrous, green. Capitula terminal, solitary or compound corymbs of 2-8, 20ï¿½40 mm wide. Ray florets 39ï¿½75, pale blue or mauve or purple, disc florets 86ï¿½241, orange. Flowering June - October. Fruits are achenes terete, 2-3 mm long, deeply striate, glabrous or subglabrous; pappus bristles 30-40, 5 mm long, subequal.

Seed collection and propagation

Collect seeds between October and November.

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
MSB	3,400 (1.96 g)	12	17-Oct-2006	DJD591 Yorke Peninsula
BGA	35,800 (22.45 g)	50+	20-Oct-2010	DJD1906 Murray	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
May-11	100%	33	47	1% agar with 250 mg/L gibberellic acid (pH 6.5); Incubated under spring/autumn conditions
May-11	96%	19	33	1% agar with 250 mg/L gibberellic acid (pH 6.5); Incubated under winter conditions
May-11	69%	47	61	1% agar; Incubated under spring/autumn conditions
May-11	65%	40	61	1% agar with 100 mg/L potassium nitrate; Incubated under spring/autumn conditions
May-11	46%	33	NA	1% agar with 100 mg/L potassium nitrate; Incubated under winter conditions
May-11	44%	26	NA	1% agar; Incubated under winter conditions
May-11	14%	32	NA	humidity chamber 40% RH 10 months (dark, summer); 1% 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)

Kangaroo Island (KAN01)	Kanmantoo	Least Concern
Southern Yorke (EYB01)	Eyre Yorke Block	Near Threatened (Probable Decline)
Eyre Hills (EYB03)		Rare (IUCN: RA d(i,ii))
Talia (EYB04)		Rare (IUCN: RA d(i,ii))
Eyre Mallee (EYB05)		Least Concern [could be records missing]
Murray Mallee (MDD02)	Murray Darling Depression	Rare (IUCN: RA ab) (Probable Decline) [short lived; fire regenerated]
Murray Lakes and Coorong (MDD03)		Regionally Extinct [presumed extinct]
Lowan Mallee (MDD04)		Near Threatened [in Billiatt CP; short-lived, fire related]