Seeds of South Australia
Acacia microcarpa (Leguminosae)
Manna Wattle
List of species for Acacia
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Seed collecting:
November to January
Herbarium regions:
Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Tintinara (NCP04)Naracoorte Coastal Plain
 Least Concern   [southern edge of range; roadside patches could be declining]
Fleurieu (KAN02)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [edge of range]
Broughton (FLB02)Flinders Lofty Block
 Rare   (IUCN: RA ab)   (Definite Decline)
Southern Flinders (FLB04) 
 Near Threatened   [mallee species, DD]
Southern Yorke (EYB01)Eyre Yorke Block
 Near Threatened   (Probable Decline)
St Vincent (EYB02) 
 Near Threatened   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern   [some unique characters in pods on sth EP]
Talia (EYB04) 
 Least Concern   [some unique characters in pods on sth EP]
Eyre Mallee (EYB05) 
 Least Concern   [some unique characters in pods on sth EP]
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [outlier, if good]
Murray Mallee (MDD02) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))
IBRA regions
DISPLAY ALL
Tintinara (NCP04)Naracoorte Coastal PlainLeast Concern
  [southern edge of range; roadside patches could be declining]
Fleurieu (KAN02)KanmantooVulnerable
  (IUCN: VU D2)   [edge of range]
2 of 6 subregionsFlinders Lofty BlockNear Threatened
, Rare
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Near Threatened
3 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
2 of 8 subregionsGawlerRare
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 Acacia]
Name derivation:
Acacia from the Greek 'akakia' and derived from 'ake' or 'akis' meaning a sharp point or thorn and 'akazo' meaning to sharpen. Dioscorides, the Greek physician and botanist used the word in the 1st century AD for the Egyptian thorn tree, Acacia arabicaMicrocarpa from the Greek 'micros' meaning small and 'carpos' meaning fruit, referring to the relatively narrow pods of the species.
Distribution:
Found on Eyre Peninsula, Yorke Peninsula, Mount Lofty Ranges, Murray and the South-east in South Australia, growing in a wide variety of vegetation and soil types. Also found in New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other States.
Plant description:
Small, rounded bushy shrubs 3 m high, with spreading branches and stems ascending from the base; branches glabrous; bark reddish-brown or dark grey on mature stems. Leaves linear-oblong or linear- lanceolate to 50 mm long and 10 mm wide; straight or curved, slightly pubescent when young, soon glabrous. Inflorescences axillary in pairs or in clusters of 3 or 4 with globular, bright yellow flower-heads. Flowering between August and October.
Fruit type:
Dark brown curved linear pod to 60 mm long and 5 mm wide.
Embryo type:
Investing.
Seed collecting:
Collect mature pods that are turning brown, with hard, dark seeds inside.
Seed cleaning:
Place the pods in a tray and leave to dry for 1-2 weeks or until the pods begin to split. Then rub the dried pods to dislodge the seeds. Use a sieve to separate any 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 physical dormancy that needs to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).