Seeds of South Australia
Swainsona oligophylla (Leguminosae)
Clay-pan Swainson-pea
List of species for Swainsona
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Seed collecting:
September to December
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern
NRM regions:
Alinytjara Wilurara, Northern and Yorke, South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))
Roxby (GAW07)Gawler
 Least Concern
Curnamona (BHC06)Broken Hill Complex
 Rare   (IUCN: RA d(i))
Dieri (SSD03)Simpson Strzelecki Dunefields
 Rare   (IUCN: RA d(i,ii))
Warriner (SSD04) 
 Least Concern
Strzelecki Desert (SSD05) 
 Least Concern
Breakaways (STP01)Stony Plains
 Near Threatened
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Near Threatened
Macumba (STP05) 
 Near Threatened
Witjira (STP06) 
 Least Concern
Baltana (STP07) 
 Least Concern
Coongie (CHC06)Channel Country
 Least Concern
Lake Pure (CHC07) 
 Least Concern
Everard Block (CER03)Central Ranges
 Near Threatened
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockRare
  (IUCN: RA d(ii))
Roxby (GAW07)GawlerLeast Concern
Curnamona (BHC06)Broken Hill ComplexRare
  (IUCN: RA d(i))
3 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
, Rare
6 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
2 of 4 subregionsChannel CountryLeast Concern
Everard Block (CER03)Central RangesNear Threatened
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. Oligophylla  from the Greek 'oligos' meaning few and 'phyllon' meaning leaves; referring to the few leaflets along the leave.
Distribution:
Found in the north-eastern part of South Australia, growing on red sand in clay pans and plains. Also found in the Northern Territory, Queensland and New South Wales.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
A prostrate or occasionally ascending perennial herb with numerous hairy stems arising from a taproot. Leaves to 4 cm long with 5-7 leaflets with purple pea-flowers. Flowering between August and October.
Fruit type:
Long dark brown pod 12 mm long and 4 mm wide covered with minute hairs.
Seed type:
Orange to brown, semi-flat reniform seed to 3 mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, dark brown containing hard seeds. 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 one collection, the seed viability was high, at 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
BGA 
MSB
17600 (42.62 g)
17600 (42.62 g)
100+28-Sep-2007DJD876
Lake Eyre
19-Sep-2008100%-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.