Seeds of South Australia
Swainsona murrayana (Leguminosae)
Murray's Slender Darling-Pea
List of species for Swainsona
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Seed collecting:
September to December
Herbarium region:
Eastern
NRM region:
South Australian Arid Lands
IBRA region
Olary Spur (FLB03)Flinders Lofty Block
 Critically Endangered   (IUCN: CR B2ab(ii,iii))   (Definite Decline)
Southern Flinders (FLB04) 
 Critically Endangered   (IUCN: CR B2ab(ii,iii))   (Definite 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. Murrayana named after the Murray River, where the type species was collected from.
Distribution:
Found only in Boolcoomatta Station, west of Broken Hill in South Australia, growing in depressions in chenopod plains on heavy soils. Also found in Queensland, New South Wales & Victoria.
Status:
Native. Very rare in South Australia. Very rare in the other states.
Plant description:
Prostrate or erect perennial herb to 25 cm high covered in fine hairs. Leaves are narrow, lance-shaped and in groups of 3-11. Flowers on a long erect stalk, usually pink with a twisted keel. Flowering between July and October.
Fruit type:
Long narrow pods to 6cm long and covered in fine hairs.
Seed type:
Yellow orange (some with dark spots) reniform seeds to 2.5mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect pods by hand when seeds are hard and turning orange, usually when pods start to turn straw brown on the plant or on the ground.
Seed cleaning:
Place the pods in a tray to dry for a week. Then rub the pods firmly with a rubber bung 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 four collections, the seed viability were high, ranging from 90% to 100%.
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
BGA6000 (44.78 g)7522-Oct-2008DJD1168
Eastern
20-Jul-2009100%-18°C
BGA6000 (38.07 g)4522-Oct-2008DJD1167
Eastern
20-Jul-200990%-18°C
BGA1300 (9.21 g)922-Oct-2008DJD1166
Eastern
20-Jul-200990%-18°C
BGA 
MSB
7500 (47.61 g)
7500 (47.61 g)
10022-Oct-2008MJT160
Eastern
20-Jul-2009100%-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
May-0998%6 d6 d 2% calcium hypochlorite solution 30 min, 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)