Seeds of South Australia
Acacia tarculensis (Leguminosae)
Tarcoola Wattle
List of species for Acacia
Click on an image to enlarge it
Seed collecting:
September to November
Herbarium regions:
North Western, Gairdner-Torrens, Eyre Peninsula
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands
IBRA region
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Volcanics (GAW02) 
 Least Concern
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Kingoonya (GAW05) 
 Least Concern
Roxby (GAW07) 
 Rare   (IUCN: RA d(i,ii))   [edge of range]
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. Tarculensis refers to the type location, Tarcoola, where the type specimen was collected by J. W. Mellor in June, 1912.
Distribution:
Endemic to South Australia and found on northern Eyre Peninsula and the Gairdner-Torrens region in South Australia, growing on rocky hillsides and ridges in tall open shrubland or low open woodland.
Status:
Native. Common in South Australia.
Plant description:

Dense, distinctly glaucous, spreading, rounded, or often flat-topped shrubs to 3 m high and often the same or more across; grey, rough and flaky bark and angular, reddish-brown, slightly pubescent branchlets. Leaves oblong to oblong-lanceolate or elliptic to 5.5 cm long and 14 mm wide; straight or slightly curved, flat, rigid, coriaceous, glaucous, golden or silvery-pubescent when young. Numerous inconspicuous veins with sometimes 2-3 veins more prominent than the others.

Margins prominent, reddish-brown, thick; glands basal. Inflorescences simple, axillary,1-2 per axil with cylindrical, mid-yellow flower-heads. Flowering between May and August or occasionally throughout the year, after good rains.

Fruit type:
Hard, grey, narrowly oblong pod to 9 cm long and 12 mm wide, flattish, much curved, densely tomentose with thickened margins.
Seed type: Hard, dark brown to black, ovoid to globular seed to 8 mm long and 6 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 with a rubber bung 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 90%.
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
2700 (262.65 g)
2700 (262.65 g)
50+3-Nov-2009DJD1690
Gairdner-Torrens
Jun-201090%-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.