Seeds of South Australia
Swainsona eremaea (Leguminosae)
Desert Orange Swainson-pea
List of species for Swainsona
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Seed collecting:
October to November
Herbarium regions:
Lake Eyre, Gairdner-Torrens
NRM region:
South Australian Arid Lands
IBRA regions
Arcoona Plateau (GAW04)Gawler
 Rare   (IUCN: RA d(ii))   [edge of range]
Dieri (SSD03)Simpson Strzelecki Dunefields
 Near Threatened
Warriner (SSD04) 
 Least Concern   [taxonimic problems; endemic to SA]
Oodnadatta (STP02)Stony Plains
 Least Concern   [taxonimic problems; endemic to SA]
Murnpeowie (STP03) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Macumba (STP05) 
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Baltana (STP07) 
 Least Concern   [taxonimic problems; endemic to SA]
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. Eremaea from the Greek 'eremites' meaning of the desert; referring to the preferred arid-land habitat of the species.
Distribution:
Endemic to South Australia and found in sandy or stony soil on floodplain in north central region.
Status:
Native. Rare in South Australia.
Plant description:
A low spreading herb to 30cm high with many hairy stems arising above the taproot. Leaves 2-9cm long with 5-11 blue-green and hairy leaflets. Flowers orange.
Fruit type:
Black stiff pod 10-15mm long covered with hairs.
Seed type:
Mottled orange, semi-flat reniform seeds to 3mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, those turning black and contain hard seeds. Mature pods can be found lying on the ground next to the plant.
Seed cleaning:
Place the pods in a tray and leave to dry for a week. 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 one collection, the seed viability was high, at 90%.
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
3500 (11.45 g)
3500 (11.45 g)
50+9-Oct-2010DJD1960
Lake Eyre
1-Jan-201290%-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.