Seeds of South Australia
Swainsona fuscoviridis (Leguminosae)
Dark Green Swainson-pea
List of species for Swainsona
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Seed collecting:
October to November
Herbarium region:
Eastern
NRM region:
South Australian Arid Lands
IBRA regions
Olary Spur (FLB03)Flinders Lofty Block
 Vulnerable   (IUCN: VU D1)
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN D)
St Vincent (EYB02)Eyre Yorke Block
 Regionally Extinct
Murray Mallee (MDD02)Murray Darling Depression
 Endangered   (IUCN: EN D)   (Probable Decline)   [Dan Duval could have more records]
Bimbowrie (BHC05)Broken Hill Complex
 Vulnerable   (IUCN: VU D1)
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. Fuscoviridis from the Latin 'fuscus' meaning dark and 'viridis' meanining green; referring to the dark colour of vegetative parts in dried material.
Distribution:
Endemic to South Australia and confined to an area west of Broken Hill.
Status:
Native. Very rare in South Australia.
Plant description:
An erect or prostrated perennial herb to 25cm high with numerous hair stems arising from a taproot. Leaves to 6cm long with 7-9 hairy, elliptic to linear or obovate leaflets. Flowers purple on densely often dark stalk.
Fruit type:
Hairy, leather dark pod to 14mm long.
Seed type:
Orang/brown mottled, semi-flat reniform seeds to 2mm long 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:
Place the pods in a tray and leave to dry for a week. When dried the pods can 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 two collections, the seed viability were high, ranging from 90% to 95%.
Seed germination:
This species has physical dormancy that need 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
9800 (22.35 g)
4900 (11.17 g)
21-Oct-2008MJT176
Eastern
20-Jul-200990%-18°C
BGA8000 (18.58 g)21-Oct-2008DJD1164
Eastern
20-Jul-200995%-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.