Seeds of South Australia
Acacia cretacea (Leguminosae)
Spindly Wattle
List of species for Acacia
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Seed collecting:
August to December
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Eyre Hills (EYB03)Eyre Yorke Block
 Critically Endangered   (IUCN: CR B2ab(i,ii,iii))   (Definite Decline)
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. Cretacea from the Latin 'cretaceus' meaning chalk-white; referring to the conspicuously chalky branchlets, inflorescences and legumes.
Distribution:
Endemic to South Australia and found in low shrubland and mallee scrub, on deep red sand in a small restricted area on Eyre Peninsula, north of Cowell.
Status:
Native. Very rare in South Australia.
Plant description:
Spindly, often single stemmed shrub or small tree to 4 m tall, crown open, straggly; rarely bushy. Bark smooth grey or red-brown on lower trunks. Leaves narrowly elliptic to narrowly oblanceolate to 10 cm long and 18 mm wide, greyish medium green. Inflorescences racemose or with a few simple peduncles, with 5-14 globular, lemon or golden-yellow flower-heads. Flowering between July and January.
Fruit type:
Long, straight or slightly curved, pale brown pod to 9 cm long and 6 mm wide.
Seed type:
Hard, black, oblong to ovoid seed to 7 mm long and 4 mm wide.
Embryo type:
Investing.
Seed collecting:
Collect mature pods that are turning brow, 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 100%.
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
2100 (71.75 g)
2100 (71.75 g)
236-Dec-2005PJA109
Eyre Peninsula
1-Aug-2006100%-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.