Seeds of South Australia
Rhodanthe oppositifolia ssp. oppositifolia (Compositae)
Twin-leaf Sunray
List of species for Rhodanthe
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Seed collecting:
September to November
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Myall Plains (GAW01)Gawler
 Endangered   (IUCN: EN B2ab(iii,iv))   (Definite Decline)   [rabbits a threat]
Gawler Volcanics (GAW02) 
 Endangered   (IUCN: EN B2ab(iii,iv))   (Definite Decline)   [rabbits a threat]
Gawler Lakes (GAW03) 
 Endangered   (IUCN: EN B2ab(iii,iv))   (Definite Decline)   [rabbits a threat]
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 Rhodanthe]
Name derivation:
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:
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.
Status:
Native. Very rare in South Australia. Common in Western Australia.
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.
Fruit type:
Brown globular daisy head.
Seed type:
White, oblong seed to 3 mm long and 2 mm wide, covered in creamy hairs and long pappus.
Embryo type:
Spatulate fully developed.
Seed collecting:
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.
Seed cleaning:
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.
Seed viability:
From one collection, the seed viability was high, at 95%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
2800 (3.1 g)
2800 (3.1 g)
50+20-Sep-2009DJD1604
Eyre Peninsula
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.