Seeds of South Australia
Swainsona microphylla (Leguminosae)
Small-leaf Swainson-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, Murray
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Eyre Hills (EYB03)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Near Threatened   [uncommon; comes & goes]
Murray Mallee (MDD02) 
 Near Threatened   (Probable Decline)   [along river]
Murray Lakes and Coorong (MDD03) 
 Regionally Extinct   [possibly extinct]
Murray Scroll Belt (RIV06)Riverina
 Near Threatened   (Probable Decline)
Gawler Volcanics (GAW02)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Maralinga (GVD03)Great Victoria Desert
 Least Concern
Kintore (GVD04) 
 Near Threatened
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(ii))
Dieri (SSD03)Simpson Strzelecki Dunefields
 Least Concern
Strzelecki Desert (SSD05) 
 Least Concern
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Lake Pure (CHC07) 
 Data Deficient
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern
Watarru (CER02) 
 Near Threatened
Tieyon (FIN03)Finke
 Data Deficient
IBRA regions
DISPLAY ALL
2 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
3 of 6 subregionsMurray Darling DepressionNear Threatened
, Regionally Extinct
Murray Scroll Belt (RIV06)RiverinaNear Threatened
  (Probable Decline)
2 of 8 subregionsGawlerRare
3 of 4 subregionsGreat Victoria DesertLeast Concern
, Near Threatened
, Rare
2 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
2 of 4 subregionsChannel CountryLeast Concern
, Data Deficient
2 of 3 subregionsCentral RangesLeast Concern
, Near Threatened
Tieyon (FIN03)FinkeData Deficient
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. Microphylla from the Greek 'micros' meaning small and 'phyllon' meaning leaf; referring to the species small leaflets.
Distribution:
Found in light soils, on sandhills or sandplain, in the north-eastern and north-western region, on Eyre peninsula and along the Murray river in South Australia. Also found in Western Australia, Northern territory, New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in other states.
Plant description:
Perennial decumbent or ascending herbs or undershrubs. Leaves variable but usually 5-15cm long, with 15-41 leaflets, each 1-5mm long. Flowers purple, or occasionally pink or white.
Fruit type:
Globular to short oblong pod to 10mm long with glabrous, papery surface.
Seed type:
Orange/brown, semi-flat reniform seeds to 2mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods. Mature pods can be found lying on the ground next to the plant containing hard seeds.
Seed cleaning:
Place the pods in a tray and leave to dry for a week. 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, at 95%.
Seed germination:
This species has physical dormancy that need 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
7600 (12.29 g)
7600 (12.29 g)
50+25-Sep-2007MJT82
Lake Eyre
19-Sep-200895%-18°C
BGA21000 (35.82 g)100+1-Nov-2010TST1092
Gairdner-Torrens
1-Jan-201295%-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.