Seeds of South Australia
Swainsona behriana (Leguminosae)
Behr's Swainson-pea
List of species for Swainsona
Display more images
Click on an image to enlarge it
Seed collecting:
October to December
Herbarium regions:
Flinders Ranges, Northern Lofty, Murray, Southern Lofty
NRM regions:
Northern and Yorke, South Australian Murray-Darling Basin
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Regionally Extinct   [extinct at Bool Lagoon, needs specific soils]
Fleurieu (KAN02)Kanmantoo
 Endangered   (IUCN: EN C2a(i); D)   (Probable Decline)   [100 + plants; found near Callington recently; has been some regev.]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Critically Endangered   (IUCN: CR C2a(i); D)   (Probable Decline)   [1 or 2 plants in Belair NP; recently thought to be extinct]
Broughton (FLB02) 
 Endangered   (IUCN: EN B2ab(ii,iii,iv))   (Definite Decline)
Olary Spur (FLB03) 
 Endangered   (IUCN: EN C2a(i))   (Probable Decline)
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN C2a(i))   (Probable Decline)
St Vincent (EYB02)Eyre Yorke Block
 Regionally Extinct
Murray Mallee (MDD02)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)   [possibly extinct]
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. Behriana named after Hermann H. Behr (1818-1904), a German-American doctor, entomologist and botanist, who collected in South Australia.
Distribution:
Once found in the Mount Lofty Ranges and the lower South-east, growing on light or occasionally heavy soils in moist grassland and woodland. Now only found in the northern and eastern side of the Mount Lofty Ranges. Also found in New South Wales and Victoria.
Status:
Native. Endangered in South Australia. This SA Seed Bank collected and banked 2,400 seeds from Bagot's Well and 260 seeds from Callington in 2016 with the support of Natural Resources Adelaide & Mount Lofty Ranges. A number of plants are being propagated for a Seed Production (SPA) area at the Botanic Gardens to assist current recovery projects. Rare in Victoria. 
Plant description:
Prostrate or low growing perennial herb to 15 cm high with many slender stems arising from a stout stock-root. Leaves to 50 mm long with 9-13 leaflets covered in fine hairs. Inflorescence purple pea-flowers in small clusters at the end of a long stalk. Flowering between August and October.
Fruit type:
Black stiff pod to 18 mm long, covered in fair hairs.
Seed type:
Light brown to orange or mottled, semi-flat reniform seed to 2 mm long and 1.5 mm wide, with a wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, those turning black and contain hard seeds. Mature pods can be found lying on the ground next to the plant.
Seed cleaning:
When dried the pods 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 80%.
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
BGA739-Nov-2010Mokota
Northern Lofty
1-Jan-2012NCT
BGA2900 (5.24 g)50+11-Nov-2010MJT327
Southern Lofty
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
Jul-1696%7 d7 d seed coat nicked with scalpel, leached in water 24 h;
1% agar;
Incubated under spring/autumn conditions
Jun-1788%1414 seed coat nicked with scalpel;
potting mix;
Incubated under winter 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)