Seeds of South Australia
Swainsona pyrophila (Leguminosae)
Yellow swainson-pea
List of species for Swainsona
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Seed collecting:
November to December
Herbarium regions:
Eyre Peninsula, Murray, Yorke Peninsula
NRM regions:
Eyre Peninsula, Northern and Yorke
IBRA regions
Southern Yorke (EYB01)Eyre Yorke Block
 Regionally Extinct
St Vincent (EYB02) 
 Critically Endangered   (IUCN: CR B2ac(iv))   (Definite Decline)   [possibly extinct]
Eyre Hills (EYB03) 
 Vulnerable   (IUCN: VU B2ac(iv))   (Probable Decline)   [extreme fluctuations]
Eyre Mallee (EYB05) 
 Vulnerable   (IUCN: VU B2ac(iv))   (Probable Decline)
Murray Mallee (MDD02)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [fire-related; hard to find; possibly extinct]
Myall Plains (GAW01)Gawler
 Vulnerable   (IUCN: VU B2ac(iv))   (Probable Decline)
Kingoonya (GAW05) 
 Vulnerable   (IUCN: VU B2ac(iv))   (Probable Decline)
Yellabinna (GVD06)Great Victoria Desert
 Vulnerable   (IUCN: VU B2ac(iv))   (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. Pyrophila from the Greek 'pyr' meaning fire and 'philos' meaning lover; referring to the germination of the species post fire (fire-lover).
Distribution:
Found in South Australia in Eyre Peninsula with a few records from Yorke Peninsula and the Murray region. Also found in New South Wales and Victoria. A fire responsive species.
Status:
Native. Very rare in South Australia. Very rare in other states.
Plant description:
Short lived perennial shrub to 1m tall with green leaves and reddish stems. Flowers are yellow pea-flowers with veins on the petals.  Flowers in winter and spring.
Fruit type:
Large bladder/balloon shaped pods turning a straw colour when matured.
Seed type:
Dark brown reniform seeds to 2mm long with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods when drying off and turning red with hard brown seeds inside.
Seed cleaning:
Place the pods in a tray and leave to dry for a week. Then rub the pods by hand and 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 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). This is a fire responsive species and usually found in areas a year or two post fire.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA2300 (6.72 g)24-Nov-2009MJT257
Eyre Peninsula
Jun-2010100%-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
July 2015100%7d7d seed coat nicked
1% water agar
Incubated under spring/autumn conditions
July 201510%14dNA None
1% water 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)