Seeds of South Australia
Swainsona vestita (Leguminosae)
Hairy Swainson-pea
List of species for Swainsona
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Seed collecting:
October to November
Herbarium region:
Lake Eyre
NRM region:
South Australian Arid Lands
IBRA region
Oodnadatta (STP02)Stony Plains
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [threatened by mining works; restricted; along roadsides]
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. Vestita from the Latin 'vestitus' meaning to clothed; referring to its long and conspicuous hairs.
Distribution:
Endemic to South Australia and found on open stony plains in a very small area around Cooper Pedy.
Status:
Native. Very rare in South Australia.
Plant description:
An  erect or ascending perennial to 25 cm high with numerous hairy stems arising from a taproot. Leaves to 10 cm with 7 narrow lanceolate hairy leaflets. Flowers purple at the end of the stalk. Flowering between August and October.
Fruit type:
Small papery bladder/balloon like pods covered in hairs.
Seed type:
Brown, semi-flat reniform seeds to 3 mm 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, ranging from 80% to 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
BGA1000 (3.41 g)20+2-Nov-2010DJD1874
Lake Eyre
1-Jan-201295%-18°C
BGA 
MSB
8900 (26.25 g)
8900 (26.25 g)
50+2-Nov-2010DJD1866
Lake Eyre
1-Jan-201280%-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
Apr-11100%5 d5 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)