Seeds of South Australia
Acacia alcockii (Leguminosae)
Alcock's Wattle
List of species for Acacia
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Seed collecting:
December to May
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Eyre Hills (EYB03)Eyre Yorke Block
 Vulnerable   (IUCN: VU D1)   [local endemic]
Talia (EYB04) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii); D1)   (Probable Decline)   [roadside pops.]
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. Alcockii commemorates Mr C. R. Alcock who collected plants extensively on Eyre Peninsula and first found this species.
Endemic to South Australia and is often found in sand over limestone, more rarely on skeletal soils or sandy soils over granite. It is restricted to the southern tip of Eyre Peninsula.
Native. Rare in South Australia.
Plant description:
Bushy shrub or small tree to 3 m often suckering, with grey or brown bark at the base and reddish on young branches. Phyllodes dark green, narrowly elliptic to oblanceolate, slightly asymmetric narrowed towards base to 9 cm long and 2 cm wide. Inflorescences axillary, racemose with globular pale-yellow flower-heads. Flowering between December and February.
Fruit type:
Brown, oblong to narrow-oblong pod to 9 cm long and 8 mm wide, not much raised over seeds, with straight edged or slightly constricted between seeds.
Seed type:
Black oblong to elliptic seed to 6 mm long and 3 mm wide.
Embryo type:
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 95%.
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)
of plants
Collection number
Collection location
% ViabilityStorage
1950 (332.3 g)
2000 (340 g)
~1208-Dec-2004DJD 73
Eyre Peninsula
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.