Seeds of South Australia
Acacia continua (Leguminosae)
Thorn Wattle
List of species for Acacia
Click on an image to enlarge it
Seed collecting:
November to January
Herbarium regions:
Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Tintinara (NCP04)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D1+2)   [oddity, could be confused with A spinescens; to be checked on ground]
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(i,ii))   [always Rare here; edge of range]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [conserved in large reserves; limited habitat]
Broughton (FLB02) 
 Near Threatened   (Probable Decline)
Olary Spur (FLB03) 
 Data Deficient   [DD]
Southern Flinders (FLB04) 
 Least Concern
Northern Flinders (FLB05) 
 Near Threatened   [only occurs on ridge-tops & rocky slopes]
Central Flinders (FLB06) 
 Least Concern
St Vincent (EYB02)Eyre Yorke Block
 Rare   (IUCN: RA b)   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Eyre Mallee (EYB05) 
 Least Concern
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Least Concern
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
Bimbowrie (BHC05)Broken Hill Complex
 Data Deficient   [DD ]
Curnamona (BHC06) 
 Least Concern
IBRA regions
DISPLAY ALL
Tintinara (NCP04)Naracoorte Coastal PlainVulnerable
  (IUCN: VU D1+2)   [oddity, could be confused with A spinescens; to be checked on ground]
Fleurieu (KAN02)KanmantooRare
  (IUCN: RA d(i,ii))   [always Rare here; edge of range]
6 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
, Data Deficient
4 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
3 of 8 subregionsGawlerLeast Concern
, Rare
2 of 4 subregionsBroken Hill ComplexLeast Concern
, Data Deficient
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 arabica. Continua from the Latin 'continua' meaning uninterrupted, referring to the phyllodes being continuous with the stem.
Distribution:
Found on Eyre Peninsula and across the Flinders and  Mt Lofty Ranges in South Australia, growing on hard alkaline, calcareous and sandy alkaline soils, in woodland, open scrub and Triodia grassland. Also found in New South Wales.
Status:
Native. Common in South Australia. Common in New South Wales.
Plant description:
Small, erect or spreading, rigid shrub to 2 m high. Branches rigid, grey-green but becoming brownish on older stems. Leaves continuous with the stem, rigid,  terete to 3.5 cm long to 2 mm wide, with 4–8 raised longitudinal veins and tapering to a pungent point. Small gland on margin and often at incurved bend in leaves. Inflorescences simple, 1 or 2 in axil with globular, golden-yellow flower-heads. Flowering between July and Octover.
Fruit type:
Brown, brittle to leathery, slightly wrinkled pods to 8 cm long and 5 mm wide, usually curved to once-coiled, constricted between and raised on alternate sides over seeds.
Seed type:
Hard, dark brown ovoid to globular seeds to 4 mm long and 3 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 viability:
From one collection, the seed viability was high, at 75%.
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
3870 (36 g)
3600 (33.14 g)
50-605-Dec-2005DJD293
Eyre Peninsula
1-Aug-200675%-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.