Seeds of South Australia
Swainsona colutoides (Leguminosae)
Bladder swainsona
List of species for Swainsona
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Seed collecting:
September to October
Herbarium regions:
Nullarbor, Gairdner-Torrens, Eastern, Eyre Peninsula, Murray
NRM regions:
Alinytjara Wilurara, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
South Olary Plain (MDD01)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [southern limit; likes fire & post fire rain]
Murray Scroll Belt (RIV06)Riverina
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [hard to find]
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [grazing by sheep & goats]
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [grazing by sheep & goats]
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(i,ii))   [grazing by sheep & goats]
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))
Everard Block (CER03)Central Ranges
 Endangered   (IUCN: )   (Probable Decline)
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. Colutoides presumably from the Latin word Colutea meaning a pod-like kind of fruit; referring to the bladder shape of the fruit.
Distribution:
Found scattered across the arid regions of South Australia. Also found in Western Australia, Northern Territory and New South Wales.
Status:
Native. Uncommon in South Australia. Rare in Northern Territory and New South Wales. Common in Western Australia.
Plant description:
Short lived shrub to 1.5m tall with reddish stems. Leaves are green and usually in groups of 13-17 leaflets. Flowers are purple along a long flower spike.
Fruit type:
Large papery bladder/balloon like pods to 30mm long. Pods remain on the stalk and are pale brown when matured.
Seed type:
Dark brown, semi-flat reniform seeds to 2mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect the pale brown pods off the plant by hand. The seeds inside should be hard and dark brown.
Seed cleaning:
Place the pods in a tray and leave to dry for at least a week. Then rub the dried pods by hand to dislodge the seeds and remove unwanted material with a sieve. 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 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
10000 (31.27 g)
10000 (31.27 g)
1020-Sep-2009TST781
Eyre Peninsula
Jun-2010100%-18°C
BGA4000 (12.42 g)20+30-Oct-2013DJD2704
North Western
24-Mar-201550%-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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-14100%10 d10 d seed coat nicked with scalpel;
1% agar;
Incubated under spring/autumn conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)