Seeds of South Australia
Swainsona tenuis (Leguminosae)
Slender Darling-pea
List of species for Swainsona
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Seed collecting:
October to December
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA regions
SUMMARY
Gawler Volcanics (GAW02)Gawler
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [grazed]
Roxby (GAW07) 
 Rare   (IUCN: RA d(ii))
Commonwealth Hill (GAW08) 
 Rare   (IUCN: RA d(ii))
Maralinga (GVD03)Great Victoria Desert
 Least Concern
Kintore (GVD04) 
 Least Concern
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(ii))   [grazed]
Carlisle (NUL01)Nullarbor
 Least Concern
Breakaways (STP01)Stony Plains
 Near Threatened
Oodnadatta (STP02) 
 Near Threatened
Macumba (STP05) 
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern
Watarru (CER02) 
 Near Threatened
Everard Block (CER03) 
 Least Concern
Pedirka (FIN04)Finke
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
3 of 8 subregionsGawlerRare
3 of 4 subregionsGreat Victoria DesertLeast Concern
, Rare
Carlisle (NUL01)NullarborLeast Concern
3 of 7 subregionsStony PlainsNear Threatened
, Rare
3 of 3 subregionsCentral RangesLeast Concern
, Near Threatened
Pedirka (FIN04)FinkeRare
  (IUCN: RA d(ii))
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. Tenuis from Latin meaning thin, slender, fine; possible referring to the small narrow leaflets.
Distribution:
Found in red sandy loan or on stony flats and rocky places in the western part of South Australia. Also found in Western Australia and Northern territory.
Status:
Native. Common in South Australia, Common in the other states.
Plant description:
A prostrate perennial with numerous dense hairy stems arising from a taproot. Leaves to 7 cm long with 5-9 small, dense hairy leaflets. Flowers purple on the end of a long stalk. Flowering between August and October.
Fruit type:
Short, brown elliptic pod to 15 mm long covered in dense hair with a thin leathery texture.
Seed type:
Orange to brown, semi-flat reniform seed to 2 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 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, at 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
BGA 
MSB
5000 (8.33 g)
5000 (8.33 g)
50+2-Nov-2010MJT332
Lake Eyre
1-Jan-201295%-18°C
BGA3500 (4.6 g)20+13-Dec-2010MJT329
Gairdner-Torrens
1-Jan-201295%-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.