Seeds of South Australia
Swainsona oliveri (Leguminosae)
Oliver's Darling-pea
List of species for Swainsona
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Seed collecting:
September to November
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eyre Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Near Threatened
South Olary Plain (MDD01)Murray Darling Depression
 Near Threatened   [very hard to find - small; undercollected]
Braemer (MDD07) 
 Rare   (IUCN: RA d(ii))
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Roxby (GAW07) 
 Least Concern
Commonwealth Hill (GAW08) 
 Least Concern
Maralinga (GVD03)Great Victoria Desert
 Least Concern
Tallaringa (GVD05) 
 Near Threatened
Yellabinna (GVD06) 
 Least Concern
Nullarbor Plain (NUL02)Nullarbor
 Rare   (IUCN: RA d(ii))
Bimbowrie (BHC05)Broken Hill Complex
 Rare   (IUCN: RA d(ii))
Curnamona (BHC06) 
 Rare   (IUCN: RA d(ii))
Breakaways (STP01)Stony Plains
 Least Concern
Oodnadatta (STP02) 
 Rare   (IUCN: RA d(ii))
Everard Block (CER03)Central Ranges
 Near Threatened
Tieyon (FIN03)Finke
 Rare   (IUCN: RA d(ii))
Pedirka (FIN04) 
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockNear Threatened
2 of 6 subregionsMurray Darling DepressionNear Threatened
, Rare
6 of 8 subregionsGawlerLeast Concern
, Rare
3 of 4 subregionsGreat Victoria DesertLeast Concern
, Near Threatened
Nullarbor Plain (NUL02)NullarborRare
  (IUCN: RA d(ii))
2 of 4 subregionsBroken Hill ComplexRare
2 of 7 subregionsStony PlainsLeast Concern
, Rare
Everard Block (CER03)Central RangesNear Threatened
2 of 2 subregionsFinkeRare
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 Swainsona]
Name derivation:
Swainsona named after Isaac Swainson (1746-1812), an English scientist and horticulturalist who had a private botanic garden near London. Oliveri named in honour of John Oliver who collected the type specimen for the species from near Port Eucla in 1882.
Distribution:
Found in plain and rocky slope on loamy or sandy soil in the drier parts of South Australia. Also found in Western Australia and New South Wales.
Status:
Native. Common in South Australia. Common in other states.
Plant description:
A slender prostrate plant with a reddish appearance. Leaves 1-4cm long with 9-13 hairy, heart-shaped leaflets, 1-7mm long. Flowers tiny 3-5mm, cream or yellow. sometime tinged with pink.
Fruit type:
Long pale to dark brown papery pod, covered in minute hairs.
Seed type:
Dark brown, semi-flat reniform seeds to 2mm long with a deep wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, pale or dark brown containing hard seeds. Mature pods can be found lying on the ground next to the plant containing hard seeds.
Seed cleaning:
Place the pods in a dry area and leave to dry. Use a rubber bung to rub the pods or break the pods open with your fingers 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 two collections, the seed viability were high, ranging from 80% to 100%.
Seed germination:
This species has physical dormancy that needs to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA2700 (4.6 g)5019-Sep-2009TST768
Gairdner-Torrens
Jun-2010100%-18°C
BGA5800 (12.45 g)25+1-Nov-2010MJT328
Gairdner-Torrens
1-Jan-201280%-18°C
BGA90224-Nov-2010KHB443
Flinders Ranges
1-Jan-2012NCT
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.