Seeds of South Australia
Swainsona stipularis (Leguminosae)
Orange Darling-pea
List of species for Swainsona
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Seed collecting:
September to December
Herbarium regions:
Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty
NRM regions:
Adelaide and Mount Lofty Ranges, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Broughton (FLB02)Flinders Lofty Block
 Vulnerable   (IUCN: VU C2a(i))   (Probable Decline)
Olary Spur (FLB03) 
 Rare   (IUCN: RA d(ii))
Southern Flinders (FLB04) 
 Least Concern
Northern Flinders (FLB05) 
 Least Concern
Central Flinders (FLB06) 
 Least Concern
St Vincent (EYB02)Eyre Yorke Block
 Critically Endangered   (IUCN: CR C2a(i))   (Definite Decline)   [heavy soils]
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [weeds a threat; edge of range]
Braemer (MDD07) 
 Rare   (IUCN: RA d(ii))
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Arcoona Plateau (GAW04) 
 Least Concern
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(i,ii))
Torrens (GAW06) 
 Least Concern
Roxby (GAW07) 
 Near Threatened
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))
Barrier Range (BHC01)Broken Hill Complex
 Rare   (IUCN: RA d(ii))
Bimbowrie (BHC05) 
 Rare   (IUCN: RA d(ii))
Curnamona (BHC06) 
 Rare   (IUCN: RA d(ii))
Dieri (SSD03)Simpson Strzelecki Dunefields
 Near Threatened   [taxonomic problems with S eremaea]
Strzelecki Desert (SSD05) 
 Near Threatened   [taxonomic problems with S eremaea]
Breakaways (STP01)Stony Plains
 Near Threatened
Oodnadatta (STP02) 
 Near Threatened
Murnpeowie (STP03) 
 Least Concern
Macumba (STP05) 
 Near Threatened
Baltana (STP07) 
 Near Threatened
Sturt Stony Desert (CHC02)Channel Country
 Near Threatened   [taxonomic issues]
IBRA regions
DISPLAY ALL
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Rare
, Vulnerable
St Vincent (EYB02)Eyre Yorke BlockCritically Endangered
  (IUCN: CR C2a(i))   (Definite Decline)   [heavy soils]
2 of 6 subregionsMurray Darling DepressionRare
6 of 8 subregionsGawlerLeast Concern
, Near Threatened
, Rare
Maralinga (GVD03)Great Victoria DesertRare
  (IUCN: RA d(i,ii))
3 of 4 subregionsBroken Hill ComplexRare
2 of 4 subregionsSimpson Strzelecki DunefieldsNear Threatened
5 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
Sturt Stony Desert (CHC02)Channel CountryNear Threatened
  [taxonomic issues]
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. Stipularis means having stipules, a basal appendage of a petiole.
Distribution:
Found on the eastern side of South Australia north of Adelaide, growing on red sandy, stony or clay flats or slopes. Also found in Queensland and New South Wales.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
A spreading perennial herb with hairy, ascending stems arising from the top of a taproot. Leaves to 9 cm long with 5-11 hairy leaflets above a long petiole and broad stipules with orange-red flowers. Flowering between July and October.
Fruit type:
Long black pod to 30 mm long with a stiff leathery texture.
Seed type:
Orange to brown, semi-flat reniform seed to 3.5 mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, black with hard seeds inside. Mature pods can be found lying on the ground next to the plant containing hard seeds.
Seed cleaning:
When dried the pods can 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 collection, the seed viability were high, ranging from 85% to 90%.
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
3000 (14.4 g)
3000 (14.4 g)
40-5023-Nov-2005DJD220
Flinders Ranges
7-Aug-200690%-18°C
BGA 
MSB
6300 (30.93 g)
2650 (13.05 g)
20+24-Sep-2007DJD840
Lake Eyre
19-Sep-200885%-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.