Plants of
South Australia
Rhodanthe oppositifolia ssp. oppositifolia
Compositae
Twin-leaf Sunray,
Twin-leaf Everlasting
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Regional Species Conservation Assessments per IBRA subregion.
Least concern
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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Prior names

Helipterum oppositifolium

Griffithia helipteroides

Common names

Twin-leaf Sunray

Twin-leaf Everlasting

Etymology

Rhodanthe from the Greek 'rhodon' meaning a rose and 'anthos' meaning a flower; referring to the rose-like flowers of Rhodanthe manglesii, the type for the genus. Oppositifolia from the Latin 'oppositus' meaning standing against or opposed and 'folium' meaning a leaf; referring to the leaves arranged opposite each other.

Distribution and status

Very few records and found on the north central Eyre Peninsula in South Australia, growing on sand over limestone, stony loam and clay in saline depressions, breakaways and stony ridges. Also found in Western Australia. Native. Very rare in South Australia. Common in Western Australia.
Herbarium region: Eyre Peninsula
NRM region: Eyre Peninsula
AVH map: SA distribution map (external link)

Plant description

Erect twiggy, annual herb to 30 cm high with red stems covered in white waxy hairs, leaves opposite, green, margin red and covered in white waxy hairs. Flowers terminal, small, papery, yellow-cream. Flowering between July and September. Fruits are brown globular daisy head. Seeds are white, oblong seed to 3 mm long and 2 mm wide, covered in creamy hairs and long pappus. Seed embryo type is spatulate fully developed.

Seed collection and propagation

Collect seeds between September and November. Collect heads that are matured, those that are drying off, fat, turning a straw colour seeds and seeds come off easily if you pull it out with your fingers. Place the heads in a tray and leave to dry for a week. Then rub the heads gently by hand or 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%.

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
2,800 (3.1 g)
2,800 (3.1 g)
50+20-Sep-2009DJD1604
Eyre Peninsula
1-Jun-201095%+5°C, -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.