Seeds of South Australia
Swainsona campylantha (Leguminosae)
Curved Swainson-pea
List of species for Swainsona
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Seed collecting:
September to December
Herbarium regions:
North Western, Lake Eyre, Gairdner-Torrens, Flinders Ranges
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [edge of range]
Arcoona Plateau (GAW04)Gawler
 Rare   (IUCN: RA d(i,ii))
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(i,ii))
Torrens (GAW06) 
 Rare   (IUCN: RA d(ii))   [edge of range]
Roxby (GAW07) 
 Rare   (IUCN: RA d(ii))   [southern edge of range]
Commonwealth Hill (GAW08) 
 Rare   (IUCN: RA d(ii))   [southern edge of range]
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))
Warriner (SSD04)Simpson Strzelecki Dunefields
 Least Concern
Strzelecki Desert (SSD05) 
 Least Concern
Breakaways (STP01)Stony Plains
 Least Concern
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Least Concern
Peake-Dennison Inlier (STP04) 
 Least Concern
Macumba (STP05) 
 Least Concern
Witjira (STP06) 
 Least Concern
Baltana (STP07) 
 Least Concern
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Diamantina-Eyre (CHC04) 
 Least Concern
Coongie (CHC06) 
 Least Concern
Lake Pure (CHC07) 
 Least Concern
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockRare
  (IUCN: RA d(ii))   [edge of range]
5 of 8 subregionsGawlerRare
Maralinga (GVD03)Great Victoria DesertRare
  (IUCN: RA d(i,ii))
2 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
7 of 7 subregionsStony PlainsLeast Concern
4 of 4 subregionsChannel CountryLeast Concern
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. Campylantha from the Greek 'capylos' meaning curved or bent and 'anthos' meaning flower, referring to the flower's wing that is strongly curved.
Distribution:
Found in the northern part of South Australia, growing in heavy red or black soils in depressions and along creek-lines. Also found in Western Australia, Northern Territory, Queensland and New South Wales.
Status:
Native. common in South Australia. Common in the other states.
Plant description:
Low growing perennial herb to 25 cm high with glabrous stems. Leaves mostly to 6 cm long with 1-7 leaflets, narrow-lanceolate to narrow-elliptic, to 40 mm long and 5 mm wide, both surfaces glabrous or with a few scattered hairs. Inflorescence a spike with 2-20 pink to purple pea-flowers with strongly curved, crescent-shaped wings. Flowering between May and November.
Fruit type:
Elliptic, slightly curved pod to 30 mm long and 4 mm wide, narrowed at both ends, more or less covered with hairs.
Seed type:
Orange, semi-flat reniform seed to 3.5 mm long and 1.2 mm wide, with a slightly wrinkled surface.
Embryo type:
Bent.
Seed collecting:
Collect mature pods, those turning brown 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 three collections, the seed viabilities 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
BGA 
MSB
5900 (12.36 g)
5900 (12.36 g)
50+30-Sep-2007DJD894
Lake Eyre
19-Sep-2008100%-18°C
BGA 
MSB
2970 (28 g)
2970 (28 g)
60-7022-Oct-2007DJD860
Lake Eyre
19-Sep-2008100%-18°C
BGA18000 (123.43 g)50+29-Sep-2007MJT128
Lake Eyre
19-Sep-200890%-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.