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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
Display IBRA region text
| Kangaroo Island (KAN01) | Kanmantoo | Rare (IUCN: ) |
| Fleurieu (KAN02) | | Rare (IUCN: ) |
Etymology
Cassinia named after Alexandre-Henri Gabriel de Cassini (1782-1832), a French botanist who published extensively on the Compositae. Adunca from Latin meaning hooked.
Distribution and status
Endemic to South Australia and found on Kangaroo Island and the Fleurieu peninsula, growing on sea cliffs. There are a few records from inland in the southern Lofty Ranges which maybe missed identified. Native. Rare in South Australia.
Herbarium regions: Southern Lofty, Kangaroo Island, Green Adelaide
NRM regions: Adelaide and Mount Lofty Ranges, Kangaroo Island
AVH map: SA distribution map (external link)
Plant description
This species is considered a hybrid of and intermediate between C. complanata and C. tegulata. It is a low-growing shrub with crowded leaves prominently tomentose beneath and branchlets roughened by the decurrent leaf bases. Inflorescences dense clusters at end of stems, with white, greenish based flowers. Fruits are light cream, dense round daisy-head. Seeds are creamy white cylindrical seed to 1 mm long and 0.4 mm wide; smooth with long white pappus at one end. Seed embryo type is spatulate.
Seed collection and propagation
Collect heads that are matured,golden brown and contain brown seeds. Place the heads in a tray for one to two week to dry. Then rub the heads gently with your hands to dislodge the seeds. Use a sieve to separate any unwanted material. Viable seeds will be small 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. Seeds are non-dormant, viable seed should germinate readily.
| Location | No. of seeds
(weight grams) | Number
of plants | Date
collected | Collection number
Collection location | Date
stored | % Viability | Storage
temperature | | BGA | 28,000 (2.45 g) | 100+ | 23-Jun-2017 | DJD3645
Southern Lofty | 1-Nov-2017 | 15% | +5°C, -18°C, -80°C |
| BGA | 38,800 (3.3 g) | 100+ | 23-Jun-2017 | DJD3645
Southern Lofty | 30-Jun-2018 | 15% | -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:
Display
| Date | Result | T0 | T50 | Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod |
| May-17 | 50% | 21 | 35 |
leached in water 24 h;
1% agar;
12/12; / 20°C |
| May-17 | 47% | 21 | NA |
leached in water 24 h;
1% agar;
Incubated under winter conditions |
| May-17 | 37% | 21 | NA |
leached in water 24 h;
1% agar;
Incubated under summer conditions |
| May-17 | 33% | 21 | NA |
500 mg/L gibberellic acid for 24 h;
1% agar;
12/12; / 10°C |
| May-17 | 27% | 21 | NA |
leached in water 24 h;
1% agar;
Incubated under spring/autumn conditions |
| May-17 | 23% | 21 | NA |
leached in water 24 h;
1% agar;
12/12; / 10°C |
| May-17 | 13% | 21 | NA |
500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under summer conditions |
| May-17 | 13% | 21 | NA |
500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under winter conditions |
| May-17 | 6% | 21 | NA |
500 mg/L gibberellic acid for 24 h;
1% agar;
12/12; / 20°C |
| May-17 | 3% | 21 | NA |
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)
