Seeds of South Australia
Boronia coerulescens ssp. coerulescens (Rutaceae)
Blue Boronia
List of species for Boronia
Display more images
Click on an image to enlarge it
Seed collecting:
October to November
Herbarium regions:
Nullarbor, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Vulnerable   (IUCN: VU D2)   [old record, imprecise loc.]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [edge of range]
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   [localised]
Fleurieu (KAN02) 
 Least Concern   [undercollected]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [loss of habitat, small pops; needs sand]
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU B2ab(ii,iii))   (Probable Decline)   [white sand species]
St Vincent (EYB02) 
 Endangered   (IUCN: EN B2ab(ii,iii))   (Probable Decline)   [white sand species]
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(ii))
Murray Mallee (MDD02) 
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(ii))   [localised, lack of habitat]
Lowan Mallee (MDD04) 
 Least Concern
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA a)   (Probable Decline)
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Volcanics (GAW02) 
 Least Concern
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(ii))
Yellabinna (GVD06) 
 Least Concern
Yalata (NUL03)Nullarbor
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainVulnerable
  (IUCN: VU D2)   [old record, imprecise loc.]
3 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Rare
2 of 2 subregionsKanmantooLeast Concern
, Rare
Mount Lofty Ranges (FLB01)Flinders Lofty BlockRare
  (IUCN: RA d(ii))   (Probable Decline)   [loss of habitat, small pops; needs sand]
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Vulnerable
, Endangered
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA a)   (Probable Decline)
2 of 8 subregionsGawlerLeast Concern
, Rare
2 of 4 subregionsGreat Victoria DesertLeast Concern
, Rare
Yalata (NUL03)NullarborRare
  (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 Boronia]
Name derivation:
Boronia named after Francesco Borone (1769-1794), an Italian botanical enthusiast who accompanied many botanical expeditions. Coerulescens meaning bluish or becoming blue; alluding to the colour of the flowers.
Distribution:
Found in the southern part of South Australia from the Nullarbor to the lower South-east, growing in mallee communities on sand. Also found in Western Australia, New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Small shrub to 50 cm high. Leaves linear-oblong to 8 mm long and 1.5 mm wide, glabrous or sparsely setose, usually glandular-warty. Inflorescences axillary, mostly solitary, rarely 2 per cyme with blue, purplish or white flowers. Flowering between August and October.
Fruit type:
Pale brown, two to four segmented capsule.
Seed type:
Black ovoid seed to 3 mm long and 1.5 mm wide with a wrinkled surface.
Embryo type:
Linear fully developed.
Seed collecting:
Collect mature capsules, those that are turning a pale straw colour and contain hard seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for a weeks. Then rub the capsules gently by hand 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 low, at 30%.
Seed germination:
This species has physiological dormancy and can be difficult to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
1485 (3.57 g)
1485 (3.57 g)
3-Nov-2005DJD261
Southern Lofty
8-Aug-200630%-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 201538%21dNA Leach in RO water for 48 hrs, then soak in 500 mg/L gibberellic acid + 10% smoke water for 24 hrs.
1% water agar
Incubated under spring/autumn conditions
May 201534%21dNA Leach in RO water for 48 hrs, then soak in 500 mg/L gibberellic acid + 10% smoke water for 24 hrs.
1% water agar
Incubated under winter conditions
May 20150%NANA None
1% water agar
Incubated under spring/autumn conditions
May 20150%NANA 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)