Seeds of South Australia
Olearia passerinoides ssp. glutescens (Compositae)
Sticky Daisy-bush
List of species for Olearia
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Seed collecting:
March to June
Herbarium regions:
Murray, Yorke Peninsula, Southern Lofty
NRM regions:
Adelaide and Mount Lofty Ranges, Northern and Yorke, South Australian Murray-Darling Basin
IBRA regions
Tintinara (NCP04)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [habitat gone]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [habitat gone]
Southern Yorke (EYB01)Eyre Yorke Block
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [Scattered occurrence at Levens Beach.]
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [edge of range]
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(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 Olearia]
Name derivation:
Olearia named after Johann Gottfried Ölschläger (1603-1671), 17th century German horticulturist and author of a flora of Halle in Germany (his name was latinized to Olearius). Alternatively, it maybe from the Latin 'olearius' pertaining to oil, from 'olea', for olive tree; alluding to the first named species resembling the olive. Passerinoides means resembling Passerina, of sparrows or sparrow-like but unsure of the reference to the species. Glutescens from the Latin 'gluten' meaning glue; alluding to the sticky nature of the plant.
Distribution:
Found in the wetter parts of South Australia, on the tip of Yorke Peninsula, southern Mount Lofty Ranges and in the Murray. Also found in New South Wales and Victoria.
Status:
Native. Rare in South Australia. Very rare in the other states.
Plant description:
Slender shrub to to 2 m high with sticky branchlets and leaves. Leaves to 20 mm long, spreading. Flowers in clusters of 2-8 at terminal, with 8-15 white (rarely mauve) ray florets and mauve to pink disc florets. Flowering between January and April. Differ from the other subspecies found in South Australia, Olearia passerinoides spp. passerinoides, which has solitary flower-head, 6-9 ray florets, short erect to appressed leaves and seeds to 6 mm long.
Fruit type:
Pale brown daisy head.
Seed type:
Brown cylindrical seed to 2 mm long (excluding the pappus) and 0.8 mm wide, with a striated surface covered in scattered hairs and long pappus bristles at one end.
Embryo type:
Spatulate fully developed.
Seed collecting:
Collect heads that are large and fluffy. Either pick off the whole heads or use your finger and pull off the seeds from the head. Mature seeds will come off easily.
Seed cleaning:
Place the heads in a tray for a week to dry. No cleaning is required if only pure seeds are collected. If heads are collected, then rub the heads gently with your hands to dislodge the seeds. Viable seeds will be fat and hard. 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 low, at 35%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
5700 (2.63 g)
5700 (2.63 g)
50+22-Mar-2006DJD439
Murray
14-Sep-200635%+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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
May-1733%14NA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under winter conditions
May-1730%14NA 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)