Seeds of South Australia
Coronidium scorpioides (Compositae)
Button Everlasting
List of species for Coronidium
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Seed collecting:
December to March
Herbarium regions:
Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, South Australian Murray-Darling Basin, South East
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Coronidium]
Name derivation:
Coronidium from the Greek 'korone' meaning a crown and the diminutive '-idion'; referring to the short pappus crown that in the Coronidium oxylepis group of species remains on the cypsela after the pappus bristles have broken near their base and fallen away. Scorpioides means resembling a scorpion; unsure which part of the plant this is referring to.
Distribution:
Found in the southern Mount Lofty Ranges to the lower South-east in South Australia, growing in reasonably well-drained open forest to heathy woodlands.  Also found in Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Rare in Queensland. Common in the other states.
Plant description:
Ascending to erect rhizomatous perennial herb to 55 cm high with simple or few-branching stems usually from a basal rosette, covered in cottony hairs. Rosette leaves (when present) obovate to oblanceolate, to 90 mm long and 21 mm wide, stem leaves similar but narrower with attenuate apices, becoming linear, usually discolorous, moderately firm-textured, upper surface hispid to scabrous from retained bases of coarse hairs, lower surface with cottony hairs, apex obtuse to acute, usually with a distinct mucro, margins flat to recurved.  Flower heads solitary, depressed-hemispherical to 35 mm diameter with pale or lemon-yellow, rarely golden-yellow daisy flower. Flowering between October and January.
Fruit type:
Dried papery daisy-head.
Seed type:
Brown oblong seed to 2.5 mm long and 0.5 mm wide, with long white feather-liked pappus.
Embryo type:
Spatulate.
Seed collecting:
Collect whole heads that are drying off or collect just the seeds by plucking it out of the centre of the daisy-flower with your fingers. Mature seeds are easily removed.
Seed cleaning:
Place the heads in a tray for a week to dry. Then pluck the seeds from the head with your finders. Viable seeds will be fat and brown. 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 germination:
Seeds are non-dormant, viable seed should germinate readily.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
October 201593%7d14d None
1% water agar
Incubated under winter conditions
October 201590%7d21d None
1% water agar
Incubated under spring/autumn conditions
October 201590%7d21d Soak in 500 mg/L gibberellic acid for 48 hrs
1% water agar
Incubated under spring/autumn conditions
October 201590%7d14d Soak in 500 mg/L gibberellic acid for 48 hrs
1% water agar
Incubated under winter 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)