Plants of
South Australia
Acacia gunnii
Leguminosae
Ploughshare Wattle
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Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
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Botanical art

Kath Alcock paintings: 5.

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. Gunnii named in honour of Ronald Campbell Gunn (1808-1881), a pioneer botanist and scientist in Tasmania.

Distribution and status

Found mainly in the Adelaide Hills area of the Mount Lofty Ranges in South Australia with an isolated population near Padthaway in the South-east. Grows on rocky hillsides and amongst rocky outcrops in open forest, associated with Eucalyptus obliqua and Eucalyptus baxteri on hard, acidic, yellow-duplex soil. Also found in Queensland, New South Wales, Victoria and Tasmania. Native. Rare in South Australia. Rare in Queensland. Common in the other States.
Herbarium regions: Southern Lofty, South Eastern
NRM regions: Adelaide and Mount Lofty Ranges, South East
AVH map: SA distribution map (external link)

Plant description

Small, rigid, diffuse, prickly, sprawling or procumbent shrubs to 80 cm high, with terete slender pubescent branchlets. Leaves broadly to narrowly triangular to 13 mm long, rigid with vein prominently raised and situated near the lower straight margin, upper margin humped or sharply angled below the middle, abruptly contracted at the base, tapering towards the apex into a free straight pungent point. Flower-spike simple and axillary, solitary with globular, whitish-yellow flower-heads. Flowering between May and September. Fruits are dark brown linear pod to 3 cm long and 4 mm wide, flat, margins thickened and constricted between the seeds. Seeds are hard, dark brown mottled globular to ovoid seed to 4 mm long and 3 mm wide, with a long string-like aril. Seed embryo type is investing.

Seed collection and propagation

Collect seeds between November and January. Collect mature pods that are turning brown, with hard, dark seeds inside. Be careful when collecting pods, as the plant is very prickly. 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 average, at 50%. 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
BGA2,100 (21.98 g)320+5-Dec-2008PJA186
Southern Lofty
1-Jan-201288%-18°C
BGA3,900 (38.46 g)1-Jan-2011Ivan Clarke
Southern Lofty
1-Jan-201250%-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.