Seeds of South Australia
Cassinia arcuata (Compositae)
Drooping Cassinia
List of species for Cassinia
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Seed collecting:
March to June
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Northern and Yorke, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Kangaroo Island (KAN01)Kanmantoo
 Regionally Extinct   [1 old record, presumed extinct]
Fleurieu (KAN02) 
 Vulnerable   (IUCN: VU D1+2)   [edge of range]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [edge of range; P Lang: quality of habitat declining]
Broughton (FLB02) 
 Near Threatened   (Probable Decline)
Olary Spur (FLB03) 
 Near Threatened   (Probable Decline)
Southern Flinders (FLB04) 
 Near Threatened   (Probable Decline)
Northern Flinders (FLB05) 
 Rare   (IUCN: RA d(i,ii))   [could be wrong ID]
Southern Yorke (EYB01)Eyre Yorke Block
 Near Threatened   (Probable Decline)
St Vincent (EYB02) 
 Near Threatened   (Probable Decline)
Eyre Hills (EYB03) 
 Rare   (IUCN: RA d(i,ii))
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(i,ii))
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [checked H Vonow]
Murray Mallee (MDD02) 
 Rare   (IUCN: RA d(i,ii))   [checked H Vonow]
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(i,ii))   [checked H Vonow]
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [checked H Vonow]
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
IBRA regions
DISPLAY ALL
2 of 2 subregionsKanmantooVulnerable
, Regionally Extinct
5 of 6 subregionsFlinders Lofty BlockNear Threatened
, Rare
, Vulnerable
4 of 5 subregionsEyre Yorke BlockNear Threatened
, Rare
3 of 6 subregionsMurray Darling DepressionRare
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))   [checked H Vonow]
Myall Plains (GAW01)GawlerRare
  (IUCN: RA d(i,ii))
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 Cassinia]
Name derivation:
Cassinia named after Alexandre-Henri Gabriel de Cassini (1782-1832), a French botanist who published extensively on the Compositae. Arcuata from Latin 'arcuatus' meaning curved or bent like a bow; referring to the bowed flowering branches.
Distribution:
Found in the south part of South Australia, growing on dry, poor ground in mallee and woodland. Also found in Western Australia, New South Wales and Victoria.
Status:
Native. Common in South Australia. Rare in Western Australia. Common in the other states.
Plant description:
Perennial shrub to 2 m high, with a curry-like aroma, stems erect, densely branched with branchlets covered in creamy hairs. Leaves spreading, linear, more or less decurrent, obtuse, to 10 mm long and 1 mm wide, upper surface glabrous or subglabrous, green, lower surface with creamy hairs, almost wholly obscured by the curved margins. Inflorescence a leafless pyramidal spike, dense to loose, erect to drooping, with buff-coloured flowers. Flowering between January and April.
Fruit type:
Loose golden daisy heads.
Seed type:
Brown cylindrical seed to 1 mm long and 0.4 mm wide, with long white pappus at one end.
Embryo type:
Spatulate.
Seed collecting:
Collect heads that are matured,golden brown and contain brown seeds.
Seed cleaning:
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.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
October 201562%7d21d soak in 500mg/L gibberellic acid for 48 hrs
1% water agar
Incubated under spring/autumn conditions
October 201550%7d42d None
1% water agar
Incubated under spring/autumn conditions
October 201530%7dNA Soak in 500mg/L gibberellic acid for 48 hrs
1% water agar
Incubated under winter conditions
October 201512%14dNA None
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)