Seeds of South Australia
Swainsona oroboides (Leguminosae)
Kneed Darling Pea
List of species for Swainsona
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Seed collecting:
September to November
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Eyre Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands
IBRA regions
SUMMARY
Braemer (MDD07)Murray Darling Depression
 Rare   (IUCN: RA d(ii))
Murray Scroll Belt (RIV06)Riverina
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [very restricted]
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
Gawler Volcanics (GAW02) 
 Least Concern
Arcoona Plateau (GAW04) 
 Rare   (IUCN: RA d(i,ii))
Torrens (GAW06) 
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Tallaringa (GVD05)Great Victoria Desert
 Near Threatened
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(i,ii))
Bimbowrie (BHC05)Broken Hill Complex
 Rare   (IUCN: RA d(ii))
Warriner (SSD04)Simpson Strzelecki Dunefields
 Near Threatened
Strzelecki Desert (SSD05) 
 Near Threatened
Breakaways (STP01)Stony Plains
 Least Concern
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Least Concern
Peake-Dennison Inlier (STP04) 
 Near Threatened
Witjira (STP06) 
 Least Concern
Baltana (STP07) 
 Least Concern
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Diamantina-Eyre (CHC04) 
 Near Threatened
Coongie (CHC06) 
 Rare   (IUCN: RA d(i,ii))
Everard Block (CER03)Central Ranges
 Rare   (IUCN: RA d(i,ii))
Tieyon (FIN03)Finke
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
Braemer (MDD07)Murray Darling DepressionRare
  (IUCN: RA d(ii))
Murray Scroll Belt (RIV06)RiverinaVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [very restricted]
4 of 8 subregionsGawlerLeast Concern
, Rare
2 of 4 subregionsGreat Victoria DesertNear Threatened
, Rare
Bimbowrie (BHC05)Broken Hill ComplexRare
  (IUCN: RA d(ii))
2 of 4 subregionsSimpson Strzelecki DunefieldsNear Threatened
6 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
3 of 4 subregionsChannel CountryLeast Concern
, Near Threatened
, Rare
Everard Block (CER03)Central RangesRare
  (IUCN: RA d(i,ii))
Tieyon (FIN03)FinkeRare
  (IUCN: RA d(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 Swainsona]
Name derivation:
Swainsona named after Isaac Swainson (1746-1812), an English scientist and horticulturalist who had a private botanic garden near London. Oroboides meaning resemble to the genus Orobus, an old genus of Fabaceae family which is now divided into a number of genera; referring to the appearance of the species to a kind of vetch. 
Distribution:
Found mostly in red sand or loam, occasionally in clay in areas with subsoil moisture such as flood-plains or gibber-plains in the north and north-eastern part of South Australia. Also found in Western Australia, Northern territory, Queensland and New South Wales. 
Status:
Native. Common in South Australia. Common in other states.
Plant description:
A prostrate or ascending perennial plant with many hairy stems arising from a taproot. Leaves 2-7cm long with 3-7 hairy, narrow lanceolate leaflets. Flowers large, purple and usually on a dense head.
Fruit type:
Dark brown, oblong or almost spherical pods 8-14mm long covered in dense hairs.
Seed type:
Orange to brown, semi-flat reniform seeds to 2mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, dark brown containing hard seed. Mature pods can be found lying on the ground next to the plant containing hard seeds.
Seed cleaning:
When dried the pods become hard and difficult to open. 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 85% to 95%.
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
BGA6000 (11.9 g)50+2-Nov-2010MJT331
Lake Eyre
1-Jan-201295%-18°C
BGA860 (1.72 g)20+5-Oct-2010DJD1875
Lake Eyre
1-Jan-201285%-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.