Seeds of South Australia
Swainsona swainsonioides (Leguminosae)
Downy Darling-pea
List of species for Swainsona
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Seed collecting:
October to November
Herbarium regions:
Lake Eyre, Eastern
NRM region:
South Australian Arid Lands
IBRA regions
Torrens (GAW06)Gawler
 Rare   (IUCN: RA d(i,ii))
Barrier Range (BHC01)Broken Hill Complex
 Rare   (IUCN: RA d(ii))
Barrier Range Outwash (BHC04) 
 Rare   (IUCN: RA d(ii))
Bimbowrie (BHC05) 
 Rare   (IUCN: RA d(ii))
Curnamona (BHC06) 
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05)Simpson Strzelecki Dunefields
 Data Deficient   [imprecise location]
Murnpeowie (STP03)Stony Plains
 Least Concern
Baltana (STP07) 
 Rare   (IUCN: RA d(ii))   [questionable ID]
Diamantina-Eyre (CHC04)Channel Country
 Data Deficient   [imprecise location]
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. Swainsonioides means resembling the genus Swainsona. Possible due to the original placement of the species under the genus Cyclogyne rather than Swainsona.
Distribution:
Found in the north-eastern part of South Australia, growing on heavy red or black soils on plains . Also found in Queensland, New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
A spreading ascending perennial with a number of stems arising from a taproot. Leaves to 12 cm or more long with 11-21 leaflets. Flowers purple, numerous on a long stalk. Flowering between August and September.
Fruit type:
Long, ovoid black pod to 35 mm long covered in hairs and with a firm texture.
Seed type:
Orange, semi-flat reniform seed to 5 mm long with a smooth surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, those drying off and contain hard seeds. Mature pods can be found lying on the ground next to the plant.
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 one collection, the seed viability was high, at 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
BGA12900 (73.15 g)50+22-Oct-2008MJT212
Eastern
20-Jul-200995%-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.