Seeds of South Australia
Neptunia dimorphantha (Leguminosae)
Sensitive Plant
List of species for Neptunia
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Seed collecting:
December to February
Herbarium region:
Lake Eyre
NRM region:
South Australian Arid Lands
IBRA regions
Dieri (SSD03)Simpson Strzelecki Dunefields
 Data Deficient   [imprecise location]
Breakaways (STP01)Stony Plains
 Near Threatened   [edge of range]
Oodnadatta (STP02) 
 Near Threatened   [edge of range]
Macumba (STP05) 
 Near Threatened   [edge of range]
Witjira (STP06) 
 Least Concern
Baltana (STP07) 
 Near Threatened
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Diamantina-Eyre (CHC04) 
 Near Threatened   [undercollected]
Coongie (CHC06) 
 Near Threatened
Lake Pure (CHC07) 
 Least 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 Neptunia]
Name derivation:
Neptunia Latin name of some water plant, from Neptunus, Neptune, Greek mythology god of the sea, rivers, and fountains. Dimorphantha from the Greek 'dis' meaning twice, 'morphe' meaning appearance and 'anthos' meaning flower; referring to the species having hermaphrodite flower, meaning it has both male and female organs, stamen and pistil.
Found in the north and north-eastern parts of South Australia, growing near creeks and flood plains. Also found in Western Australia, Northern Territory, Queensland and New South Wales.
Native. Uncommon in South Australia. Rare in New South Wales. Common in the other states.
Plant description:
Prostrate or weakly ascending herb with stems to 60 cm long, glabrous or hairy. Leaves with 2-4 rarely 5 or 6 pairs of leaflets, glabrous or pubescent, closed when touched. Flower-spikes axillary, globoid or nearly ellipsoid, yellow flowers on  a long stalk. Flowering between September and November.
Fruit type:
Brown ovoid pod to 10 mm long, flat, hairy.
Seed type:
Dark-brown seed.
Seed collecting:
Collect mature pods, those turning brown and contain hard, dark seeds inside.
Seed cleaning:
Place the pods in a tray and leave to dry for one to two weeks. Then rub the pods with a rubber bung 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 germination:
This species has physiological dormancy that need to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).