Seeds of South Australia
Maireana sedifolia (Chenopodiaceae)
Pearl Bluebush
List of species for Maireana
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Seed collecting:
November to February
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Murray, Yorke Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Broughton (FLB02)Flinders Lofty Block
 Least Concern
Olary Spur (FLB03) 
 Least Concern
Southern Flinders (FLB04) 
 Near Threatened   (Definite Decline)   [Severe loss of habitat, grazed, little regeneration]
Northern Flinders (FLB05) 
 Least Concern   [grazed]
Central Flinders (FLB06) 
 Least Concern   [grazed]
St Vincent (EYB02)Eyre Yorke Block
 Least Concern   (Probable Decline)   [persists on roadsides & remnants]
Eyre Hills (EYB03) 
 Near Threatened
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Least Concern
Murray Mallee (MDD02) 
 Least Concern
Braemer (MDD07) 
 Least Concern
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Least Concern
Gawler Lakes (GAW03) 
 Least Concern
Arcoona Plateau (GAW04) 
 Near Threatened
Kingoonya (GAW05) 
 Least Concern
Roxby (GAW07) 
 Least Concern
Commonwealth Hill (GAW08) 
 Least Concern
Maralinga (GVD03)Great Victoria Desert
 Least Concern
Tallaringa (GVD05) 
 Near Threatened
Yellabinna (GVD06) 
 Least Concern
Carlisle (NUL01)Nullarbor
 Least Concern
Nullarbor Plain (NUL02) 
 Least Concern
Yalata (NUL03) 
 Least Concern
Hampton (HAM01)Hampton
 Least Concern
Barrier Range (BHC01)Broken Hill Complex
 Least Concern
Barrier Range Outwash (BHC04) 
 Least Concern
Bimbowrie (BHC05) 
 Least Concern
Curnamona (BHC06) 
 Least Concern
Warriner (SSD04)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05) 
 Rare   (IUCN: RA d(ii))
Breakaways (STP01)Stony Plains
 Least Concern
Oodnadatta (STP02) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Murnpeowie (STP03) 
 Near Threatened   (Probable Decline)   [Grazing, edge of range]
Baltana (STP07) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Everard Block (CER03)Central Ranges
 Rare   (IUCN: RA d(i,ii))
IBRA regions
DISPLAY ALL
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
3 of 5 subregionsEyre Yorke BlockLeast Concern
, Near Threatened
3 of 6 subregionsMurray Darling DepressionLeast Concern
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))
7 of 8 subregionsGawlerLeast Concern
, Near Threatened
3 of 4 subregionsGreat Victoria DesertLeast Concern
, Near Threatened
3 of 3 subregionsNullarborLeast Concern
Hampton (HAM01)HamptonLeast Concern
4 of 4 subregionsBroken Hill ComplexLeast Concern
2 of 4 subregionsSimpson Strzelecki DunefieldsRare
4 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
, Rare
Everard Block (CER03)Central RangesRare
  (IUCN: RA d(i,ii))
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 Maireana]
SA Flora:
Flora of South Australia Edition 5
Name derivation:
Maireana named after Adolphe Lemaire, a 19th certury belgium botanist and 'sedifolia' sedum shaped leaves
Distribution:
Grows on calcareous soils, frequently on rises
Plant description:
Compact divaricately branched shrub to 1.5 m high, covered with a close bluish-grey woolly tomentum, dioecious. Leaves alternate, fleshy, narrowly obovoid, 4-8 mm long. Flowers in pairs but usually only one maturing, closely woolly, the male hemispherical and the female globular. Flowering all year round.
Fruit type:
Fruiting perianth straw-coloured or pale brown when dry; tube sparsely hairy, turbinate, to 2 mm high; horizontal wing c. 10 mm diam., glabrous, faintly veined, with a radial slit
Seed type:
Seeds are brown and disc shaped, up to 1.5 mm diameter with overlapping embryo tip forming a small beak.
Embryo type:
Peripheral
Seed collecting:
Collect seeds when fruits are brown and papery. Check inside several fruits for the presence of well developed seed before making a collection
Seed cleaning:
Remove twigs and other plant material
Seed germination:
Germination 75%, seed scarified (covering structure removed) on 1% w/v agar, 8/16 dark/light, 15°C. See http://data.kew.org/sid
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jan-1369%7 d7 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under summer conditions
Jan-1360%7 d7 d
1% agar;
Incubated under spring/autumn conditions
Jan-1357%7 d7 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions
Jan-1357%7 d14 d
1% agar;
Incubated under winter conditions
Jan-1352%7 d7 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions
Jan-1340%7 dNA
1% agar;
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)