Ozothamnus pholidotus

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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Ozothamnus, from the Greek 'ozo', meaning to smell and 'thamnos', meaning shrub, alluding to the fragrant foliage when crushed. Pholidotus, from the Greek 'pholidoros' meaning scaly, referring to the branchlets covered with scale-like leaves.

Found in the upper South-east and lower Murray region in South Australia, growing in mallee and heath on richer soils, often in association with Eucalyptus leucoxylon. Also found in Victoria. Native. Rare in South Australia. Uncommon in Victoria. More locally common after a bushfire.
Herbarium regions: Murray, South Eastern
NRM regions: South Australian Murray-Darling Basin, South East
AVH map: SA distribution map (external link)

Glabrous, erect shrub to 1.5 m high. Dense flexible branchlets covered with imbricate, scale-like leaves. Leaves lanceolate; subacute to 4 mm long; bright green. Inflorescence a dense hemispherical corymb to 40 mm wide, with 4-6 florets that are white to dull cream; corolla yellow. Flowering between September and December. Fruits are dense cream-brown heads. Seeds are brown, narrowly cylindrical seed to 1.5 mm long and 0.5 mm wide, covered sparsely with short white hairs. Seed embryo type is spatulate, fully-developed.

Collect seeds between January and March. Collect mature seed heads turning a cream-brown. Place the heads in a tray and leave to dry for 1-2 weeks, then rub the heads gently with your hands 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%.

Location	No. of seeds (weight grams)	Number of plants	Date collected	Collection number Collection location	Date stored	% Viability	Storage temperature
BGA	6,000 (0.86 g)	40+	7-Jan-2011	TST1106 South Eastern	1-Jan-2012	95%	+5°C, -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.

Date	Result	T0	T50	Pre-treatment \| Germination medium \| Incubator: Photoperiod / Thermoperiod
May-11	46%	26	NA	1% agar with 250 mg/L gibberellic acid (pH 6.5); Incubated under winter conditions
May-11	27%	33	NA	1% agar with 250 mg/L gibberellic acid (pH 6.5); Incubated under spring/autumn conditions
May-11	17%	33	NA	1% agar; Incubated under spring/autumn conditions
May-11	6%	26	NA	1% agar with 100 mg/L potassium nitrate; Incubated under spring/autumn conditions
May-11	2%	39	NA	humidity chamber 40% RH 10 months (dark, summer); 1% agar; Incubated under winter conditions
May-11	0%	NA	NA	1% agar with 100 mg/L potassium nitrate; Incubated under winter conditions
May-11	0%	NA	NA	1% 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)

Tintinara (NCP04)	Naracoorte Coastal Plain	Vulnerable (IUCN: VU D2) [persists for a long time; episodic after fire]
Murray Mallee (MDD02)	Murray Darling Depression	Vulnerable (IUCN: VU B2ab(i,ii,iii)) (Probable Decline) [not found in recent surveys]
Lowan Mallee (MDD04)		Vulnerable (IUCN: VU B2ab(i,ii,iii)) (Probable Decline)
Murray Scroll Belt (RIV06)	Riverina	Endangered (IUCN: EN B2ab(i,ii,iii); D) (Probable Decline) [requires fire regeneration]