Seeds of South Australia
Leptospermum coriaceum (Myrtaceae)
Green Tea-tree
List of species for Leptospermum
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium regions:
Nullarbor, Gairdner-Torrens, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Tintinara (NCP04)Naracoorte Coastal Plain
 Least Concern
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(i,ii))   [edge of range; Monarto area; needs deep sand]
Southern Flinders (FLB04)Flinders Lofty Block
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [isolated pops]
Southern Yorke (EYB01)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
St Vincent (EYB02) 
 Vulnerable   (IUCN: VU C2a(i))   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Near Threatened   [northern limit]
Murray Mallee (MDD02) 
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)   [not in good condition]
Lowan Mallee (MDD04) 
 Least Concern
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Volcanics (GAW02) 
 Least Concern
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(ii))
Yellabinna (GVD06) 
 Least Concern
Nullarbor Plain (NUL02)Nullarbor
 Rare   (IUCN: RA d(ii))
Yalata (NUL03) 
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
Tintinara (NCP04)Naracoorte Coastal PlainLeast Concern
Fleurieu (KAN02)KanmantooRare
  (IUCN: RA d(i,ii))   [edge of range; Monarto area; needs deep sand]
Southern Flinders (FLB04)Flinders Lofty BlockRare
  (IUCN: RA d(i,ii))   (Probable Decline)   [isolated pops]
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
, Vulnerable
4 of 6 subregionsMurray Darling DepressionLeast Concern
, Near Threatened
, Rare
4 of 8 subregionsGawlerLeast Concern
, Rare
2 of 4 subregionsGreat Victoria DesertLeast Concern
, Rare
2 of 3 subregionsNullarborRare
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 Leptospermum]
Name derivation:
Leptospermum from the Greek 'leptos' meaning fine, thin or slender and 'sperma' meaning seed; referring to the narrow seeds of the type species. Coriaceum from the Latin 'corium' meaning leather; possibly referring to the thick leaves.
Distribution:
Found in the southern part of South Australia, except on Kangaroo Island and the lower South-east, growing in mallee-heath and heathlands on inland dunes on sandy soils. Also found in New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Spreading shrub to 2 m high. Leaves flat, ovate to oblanceolate or elliptic, to 20 mm long and 5 mm wide, glabrous, usually yellow-green or light green. Inflorescence borne on short axillary shoots with white flowers to 15 mm wide, petals broadly obovate. Flowering between June and October.
Fruit type:
Woody fruit to 8 mm wide, deciduous.
Seed type:
Semi-flat reddish-brown ovoid seed to 2.3 mm long and 1 mm wide, with narrow wing around the edge and a reticulate surface.
Embryo type:
Folded.
Seed collecting:
Collect mature capsules, those that are turning brown, hard with non-open valves. Mature fruits can remain on the plant unopened for sometime but will eventually shed.
Seed cleaning:
Place the capsules in a tray and leave to dry for a week or two. This allows the valves on the fruit to open and release the seeds. Separate the seeds by placing all the materials into a bucket and shaking it to dislodge the seeds. Pass the material through a sieve to separate the unwanted material. The finer material will contain both seeds and frass usually distinguishable from each other. With finer sieves, the seeds can be separated from the frass but this is not essential for storage or propagation. 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 average, at 65%.
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
43600 (45.79 g)
43600 (45.79 g)
50+5-Sep-2005HPV2551
Eyre Peninsula
8-Aug-200665%-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
Oct-1174%21 d56 d
1% agar with 100 mg/L potassium nitrate;
Incubated under spring/autumn conditions
Oct-1158%21 d56 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions
Oct-1130%35 dNA
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions
Oct-1128%28 dNA
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions
Oct-1124%28 dNA
1% agar;
Incubated under spring/autumn conditions
Oct-1118%42 dNA
1% 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)