Plants of
South Australia
Roepera aurantiaca ssp. aurantiaca
Zygophyllaceae
Shrubby Twinleaf
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Regional Species Conservation Assessments per IBRA subregion.
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Near threatened
Rare
Vulnerable
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Extinct
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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: 5

Prior names

Zygophyllum aurantiacum ssp. aurantiacum

Roepera aurantiaca

Zygophyllum fruticulosum var. bilobum

Zygophyllum fruticulosum

Etymology

Roepera (formally Zygophyllum which is from the Greek 'zygon' meaning pair and 'phyllon' meaning leaf; referring to the pair of leaflets making up each leaf) is named after Johannes August Christian Roeper (1801 -1885), a German botanist and physician. Aurantiaca from the Latin 'aurantiacus' meaning yellow-orange.

Distribution and status

Found across South Australia except on Kangaroo Island and in the South-East, growing in a variety of habitats and on different soils. Also found in all mainland states. Native. Common in South Australia. Common in the other states.
Herbarium regions: North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty
NRM regions: Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
AVH map: SA distribution map (external link)

Plant description

A perennial, woody and bushy shrub that may grow to 1 m high and 1 m wide. Leaves are linear, fleshy and 'Y'-shaped with large yellow flowers. This subspecies differ from the other three subspecies found in South Australia, by having leaves with distinct petioles and leaflets, flat, narrow-oblong to linear, about as long as the linear petiole. Flowering between July and October. Fruits are yellow-brown round, four segmented capsule with paper wings. Each segment contains one seed. Seeds are pale brown, wedge-shaped to 5 mm long and 3 mm wide. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between October and February. Collect semi-dried and dried capsules by running your hands through the stems of the plant. Mature fruits will come off easily and will have a hard and dark seed inside each segment. Place the capsules in a tray and leave to dry for 1 to 2 weeks, depending on how green the fruit is. Then rub the dried capsules to dislodge the seeds. Use a sieve to remove 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. Seed viability is usually high.

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
2,100 (7.21 g)
2,100 (7.21 g)
3015-Oct-2007TST190
Eyre Peninsula
19-Sep-200890%-18°C
BGA 
MSB
10,000 (29.82 g)
10,000 (29.82 g)
50+21-Sep-2014DJD3029
North Western
1-Jan-2016100%-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.
Germination table:
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