Plants of
South Australia
Acacia adsurgens
Leguminosae
Whipstick Wattle
Display all 11 images
Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Display IBRA region text

Botanical art

Kath Alcock paintings: 3.

Etymology

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. Adsurgens mean to become erect.erect, referring to the species' erect habit.

Distribution and status

Found only in a small area in the far northeast of South Australia. Grows in reddish sandy and gravelly soils, on plains and hillsides, commonly in spinifex grassland communities. Also found in Western Australia, Northern Territory and Queensland. Native. Rare in South Australia. Common in the other States.
Herbarium region: Lake Eyre
NRM region: South Australian Arid Lands
AVH map: SA distribution map (external link)

Plant description

Shrub or small tree to 4 m high. Bark smooth then splitting or fibrous, grey-brown, reddish beneath. Phyllodes linear, straight or upwardly curved, flat to 18 cm long and 4.5mm wide, glabrous, resinous, particularly when young. Inflorescences axillary, solitary with clylindrical, yellow flower-heads. Flowering between May and September, sometimes as early as Feb. Fruits are light brown, linear pod to 12cm long and 3.5mm wide, straight or slightly curved, slightly raised over and constricted between seeds, with no prominent margins. Seeds are hard, dark drown to black ovoid seed to 5 mm long and 2.5 mm wide. Seed embryo type is investing.

Seed collection and propagation

Collect seeds between October and November. Collect mature pods that are turning brown with hard, dark seeds inside. 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. From one collection, the seed viability was high, at 90%. 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:
  Hide
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA1,600 (18.08 g)20+25-Oct-2007DJD922
Lake Eyre
19-Sep-200890%-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.