Seeds of South Australia
Ozothamnus retusus (Compositae)
Notched Bush-everlasting
List of species for Ozothamnus
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Seed collecting:
January to February
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Tintinara (NCP04)Naracoorte Coastal Plain
 Near Threatened
Kangaroo Island (KAN01)Kanmantoo
 Near Threatened   [regenerates after fire]
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [not many recent records]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened
Broughton (FLB02) 
 Near Threatened   (Probable Decline)
Southern Flinders (FLB04) 
 Near Threatened   (Probable Decline)
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Southern Yorke (EYB01)Eyre Yorke Block
 Near Threatened   (Probable Decline)
St Vincent (EYB02) 
 Near Threatened   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [record potentially questionable]
Murray Mallee (MDD02) 
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU B2ab(ii,iii))   (Probable Decline)
Lowan Mallee (MDD04) 
 Least Concern
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))
Yellabinna (GVD06)Great Victoria Desert
 Least Concern
IBRA regions
DISPLAY ALL
Tintinara (NCP04)Naracoorte Coastal PlainNear Threatened
2 of 2 subregionsKanmantooNear Threatened
, Rare
4 of 6 subregionsFlinders Lofty BlockNear Threatened
, Rare
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Near Threatened
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
, Vulnerable
2 of 8 subregionsGawlerRare
Yellabinna (GVD06)Great Victoria DesertLeast Concern
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 Ozothamnus]
Name derivation:
Ozothamnus from the Greek 'ozo' meaning to smell and 'thamnos' meaning shrub; alluding to the fragrant foliage when crushed. Retusus from the Latin 'retusus' meaning rounded, notched at the apex; referring to the retuse apex of the leaves.
Distribution:
Found in the southern part of South Australia, growing in mallee vegetation and rocky ground. Also found in Victoria.
Status:
Native. Common in South Australia. Common in Victoria.
Plant description:
Erect shrub to 1.5 m high with branchlets covered in dense cottony hairs. Leaves spreading, sessile, linear, to 18 mm long and 2.5 mm wide, glabrous and scabrous above, dense cottony hairs and glandular beneath, apex retuse or emarginate or a few leaves with minutely decurved-mucronate point, base decurrent into 2 prominent green, glabrous ridges, margins revolute. Inflorescences hemispherical, to 5.5 cm diameter with cream to yellow flowers. Flowering between October and December.
Fruit type:
Dense creamy brown heads.
Seed type:
Brown cylindrical seed to 1 mm long and 0.5 mm wide, covered sparely with short white hairs and long white pappus at one end.
Embryo type:
Spatulate fully developed.
Seed collecting:
Collect mature seed heads, those turning a creamy-brown.
Seed cleaning:
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.
Seed viability:
From one collection, the seed viability was average, at 75%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
44520 (17.81 g)
44500 (18.3 g)
~6012-Jan-2005MKJ 65
Eyre Peninsula
31-Mar-2006100%-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.