Seeds of South Australia
Rhodanthe gossypina (Compositae)
Cottony Paper-daisy
List of species for Rhodanthe
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Seed collecting:
September to November
Herbarium region:
Lake Eyre
NRM region:
South Australian Arid Lands
IBRA region
Coongie (CHC06)Channel Country
 Vulnerable   (IUCN: VU D2)   [edge of range]
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. Goosypina from the Latinised form of the Arabic name 'goz' for a soft substance (cotton), referring to the cotton-like hairs covering the plant.
Found in the far north-eastern corner of South Australia, growing on heavy soil in open situations that is frequently flooded. Also found in the Northern Territory and Queensland.
Native. Rare in South Australia. Rare in the Northern Territory. Common in Queensland.
Plant description:
Erect annual herb to 20 cm high covered in cotton-like hairs. Leaves linear to narrow-oblong to 4 cm long and 5 mm wide. Inflorescence in terminal clusters with paper daisy flowers. Flowering between June and September. This species is similar to Rhodanthe corymbiflora and R. microglossa from which it can be distinguished having a more open inflorescence, smaller involucre with bract-lamina about halft as long, having dark resinous hairs on the stereome of the inner bracts and having a smooth throat to the corolla.
Fruit type:
Brown fluffy daisy head.
Seed type:
Brown oblong seed to 2.3 mm long and 0.7 mm wide, covered in pale brown 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 average, at 70%.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
May-177%21NA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under winter conditions
May-170%NANA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under spring/autumn conditions
Result: Maximum percentage of germination observed.
T0: Number of days before first germinant observed.
T50: Number of days to achieve 50% germination.
Pre-treatment: The initial treatment that the seeds received prior to placement on germination media.
Germination medium: The substrate that seeds were placed on for the duration of the germination experiment.
Incubator conditions:
Photoperiod: The duration of light exposure that the seeds were subject to during a 24 hour period.
Thermoperiod: The constant or diurnal temperatures that seeds were subject to during a 24 hour period.
Winter conditions: 15°C 20 h (3am→11pm); 5°C 4 h (11pm→3am) / 10 h light (8am→6pm); 14 h dark (6pm→8am)
Spring/Autumn conditions: 22°C 12 h (8am→8pm); 10°C 12 h (8pm→8am) / 12 h light (8am→8pm); 12 h dark (8pm→8am)
Summer conditions: 30°C 14 h (6am→8pm); 15°C 10 h (8pm→6am) / 14 h light (6am→8pm); 10 h dark (8pm→6am)