Seeds of South Australia
Acacia gunnii (Leguminosae)
Ploughshare Wattle
List of species for Acacia
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Seed collecting:
November to January
Herbarium regions:
Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South East
IBRA regions
Lucindale (NCP03)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D1+2)   [highly localised in Easter Rocks, granite outcrops, few 100 plants, could be Endangered]
Fleurieu (KAN02)Kanmantoo
 Critically Endangered   (IUCN: CR D)   [(no records) Martin O'Leary has a specimen from Parawa]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [under threat from drying climate, deer trampling, slashing; likes rocky outcrops; mainly occurs in parks; western outlier]
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. Gunnii named in honour of Ronald Campbell Gunn (1808-1881), a pioneer botanist and scientist in Tasmania.
Distribution:
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.
Status:
Native. Rare in South Australia. Rare in Queensland. Common in the other states.
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.
Fruit type:
Dark brown linear pod to 3 cm long and 4 mm wide, flat, margins thickened and constricted between the seeds.
Seed type:
Hard, dark brown mottled globular to ovoid seed to 4 mm long and 3 mm wide, with a long string-like aril.
Embryo type:
Investing.
Seed collecting:
Collect mature pods that are turning brown, with hard, dark seeds inside. Be careful when collecting pods, as the plant is very prickly.
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 average, at 50%.
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
BGA3900 (38.46 g)1-Jan-2011Ivan Clarke
Southern Lofty
1-Jan-201250%-18°C
PJA1861-Jan-2012-18°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.