Plants of
South Australia
Eutaxia diffusa
Leguminosae
Spreading Eutaxia
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Regional Species Conservation Assessments per IBRA subregion.
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Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
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Botanical art

Kath Alcock paintings: 6.

Etymology

Eutaxia from the Greek 'eu' meaning well and 'taxis' meaning arrangement in row, referring to the regular arrangement of leaves. Diffusa from Latin meaning to spread out or wide, alluding to either its spreading habit or relatively uncrowded leaves.

Distribution and status

Found on the southern Eyre Peninsula, Flinders Ranges, Yorke Peninsula, Mount Lofty Ranges, Kangaroo Island and the upper South-east in South Australia growing in mallee communities. Also found in Queensland, New South Wales and Victoria. Native. Common in South Australia. Common in all States.
Herbarium regions: Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions: Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
AVH map: SA distribution map (external link)

Plant description

Variable shrub, often low, dense and intricate, or erect with stems usually glabrous, with smaller ones often spinescent. Leaves opposite, obovate to ovate or rhombic to 7 mm long and 3 mm wide; apex subacute, concave, keeled, usually glabrous. Flowers to 6 mm long, solitary, or rarely paired; yellow, lacking obvious red veins, with purple keel. Flowering between August and November. Fruits are brown pod to 5 mm long, very swollen with a long stripe. Seeds are brown mottled reniform seed to 2.5 mm long and 2 mm wide, dull, with a long aril. Seed embryo type is bent.

Seed collection and propagation

Collect seeds between November and January. Collect maturing pods, those brown or turning brown and contain hard black seeds inside. Place the pods in a paper bag and leave to dry for one to two weeks. Then rub the pods with a rubber bung to dislodge the seeds. Use a sieve to separate the 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 95%. This species has physical dormancy that needs to be overcome for the seed to germinate. The seed coat needs to be ruptured so that water can enter the seed before germination can occur. Methods to rupture the seed coat include scarification with sand paper or nicking the seed coat with a sharp blade or hot water treatment by immersion in boiling water.

Seeds stored:
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LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
3,000 (10.8 g)
3,000 (10.8 g)
602-Dec-2004DJD59
South Eastern
31-Mar-200695%-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.