Seeds of South Australia
Calytrix tetragona (Myrtaceae)
Common Fringe-myrtle
List of species for Calytrix
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Seed collecting:
November to January
Herbarium regions:
Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Glenelg Plain (NCP02) 
 Least Concern
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Least Concern   [widespread and stable]
Fleurieu (KAN02) 
 Least Concern
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Broughton (FLB02) 
 Least Concern
Southern Flinders (FLB04) 
 Least Concern
Northern Flinders (FLB05) 
 Least Concern
Central Flinders (FLB06) 
 Least Concern
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Vulnerable   (IUCN: VU B2ab(iii))   (Probable Decline)   [Data deficient.]
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Wimmera (MDD05) 
 Least Concern
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
Yellabinna (GVD06)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainRare
  (IUCN: RA d(i,ii))   [edge of range]
4 of 4 subregionsNaracoorte Coastal PlainLeast Concern
2 of 2 subregionsKanmantooLeast Concern
5 of 6 subregionsFlinders Lofty BlockLeast Concern
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Vulnerable
4 of 6 subregionsMurray Darling DepressionLeast Concern
3 of 8 subregionsGawlerRare
Yellabinna (GVD06)Great Victoria DesertRare
  (IUCN: RA d(i,ii))   [limited habitat]
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 Calytrix]
Name derivation:
Calytrix from the Greek 'kalyx' meaning calyx and 'thrix' meaning hair; referring to the awns on the sepals. Tetragona from the Greek 'tetra' meaning four and 'gonia' meaning angle; referring to the leaf blade.
Distribution:
Found in the southern part of South Australia, growing in a wide range of habitats including heath, mallee and open forest. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Shrub to 3 m high with pubescent to glabrous branchlets. Leaves pubescent to glabrous, linear to ovate, to 12 mm long and 1 mm wide, in transverse section depressed-angular-obovate to very broadly obtriangular, margins often finely toothed or ciliate. Flowers white to pink with a long base. Flowering between August and October.
Fruit type:
Thin brown fruit with persistent calyx and awns.
Seed type:
A cylindrical seed sits in the thin tubular section of the fruit. The ridged seed coat is straw coloured.
Embryo type:
Spatulate fully developed.
Seed collecting:
Collect heads by hand when they are brown and slightly fat at the base. This should contain small hard seed.
Seed cleaning:
No cleaning is required if only the fruits were collected. If collected with other material, 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:
Seed set and seed viability can be low. From two collections, the seed viability were low, ranging from 18% to 44%.
Seed germination:
This species has physiological dormancy that needs to be overcome for the seed to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
2424 (4.92 g)
2750 (5.34 g)
>1001-Dec-2004DJD 57
South Eastern
31-Mar-200644%-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
November 201462%41d79d Heat at 90°C for 15 minutes; then soak in 250 mg/L gibberellic acid + 10% smoke water for 24 hours
1% water agar
Incubated under spring/autumn conditions
November 201428%57dNA Soak in 250 mg/L gibberellic acid + 10% smoke water for 24 hours
1% water agar
Incubated under spring/autumn conditions
November 20140%NANA None
1% water agar
Incubated under spring/autumn conditions
November 20140%NANA Soak in 250 mg/L gibberellic acid for 24 hours
1% water 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)