Seeds of South Australia
Eucalyptus oleosa ssp. ampliata (Myrtaceae)
Acorn Mallee
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium regions:
Nullarbor, Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island
NRM regions:
Adelaide and Mount Lofty Ranges, Alinytjara Wilurara, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   [protected in a number of parks & likely to be stable]
Fleurieu (KAN02) 
 Vulnerable   (IUCN: VU D2)   [does not suffer from drought as badly as other sp; in Newland Head, restricted]
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Least Concern   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU D2)   [taxonomic issues; now defined on seedling morphology]
Braemer (MDD07) 
 Data Deficient
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Data Deficient
Gawler Lakes (GAW03) 
 Data Deficient
Yellabinna (GVD06)Great Victoria Desert
 Rare   (IUCN: RA d(ii))
Nullarbor Plain (NUL02)Nullarbor
 Rare   (IUCN: RA d(ii))
Yalata (NUL03) 
 Least Concern
Hampton (HAM01)Hampton
 Least Concern
IBRA regions
DISPLAY ALL
2 of 2 subregionsKanmantooRare
, Vulnerable
5 of 5 subregionsEyre Yorke BlockLeast Concern
3 of 6 subregionsMurray Darling DepressionRare
, Vulnerable
, Data Deficient
3 of 8 subregionsGawlerLeast Concern
, Data Deficient
Yellabinna (GVD06)Great Victoria DesertRare
  (IUCN: RA d(ii))
2 of 3 subregionsNullarborLeast Concern
, Rare
Hampton (HAM01)HamptonLeast Concern
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 Eucalyptus]
Name derivation:
Eucalyptus from the Greek 'eu' meaning well and 'calyptos' meaning covered; alluding to the cap or lid which covers the stamens in the bud. Oleosa from Latin meaning full of oil; referring to the adult leaves containing plenty of essential oils. Ampliata from the Latin 'ampliatus' meaning increased; alluding to the often larger leaves, buds and fruits of this subpsecies compared to E. oleosa subsp. oleosa.
Distribution:
Found in the southern part of South Australia, from the Nullarbor to the Fleurieu Peninsula, growing in mallee vegetation on shallow, calcareous, red, brown or pale grey loams overlying limestone. Also found in Western Australia.
Status:
Native. Common in South Australia. Common in Western Australia.
Plant description:
Multi-stemmed mallee to 10 m tall with rough, flaky fibrous, grey to brown bark on the lower stems and smooth above. Seedling leaves small, spirally-arranged, ellipse-shaped. Juvenile leaves spirally arranged around a five-sided stems, elliptical, dull, green to blue-green. Adult leaves to 120 mm long and 23 mm wide, lanceolate to broad-lanceolate, glossy, green. Flowers axillary in groups of 7-11. Buds to 10.5 mm long and 5 mm wide, smooth, bud-cap cone-shaped, narrower to slightly wider than the base. Flowers white appearing in summer and autumn. This subspecies can only be dinstinguished reliably from E. oleosa ssp. oleosa by their seedlings. where seedlings are not available, subspecies can be identified base on their distribution. This subspecies generally occurs in more coastal regions compared to E. oleosa ssp. oleosa which occurs more inland.
Fruit type:
Barrel-shaped to round-shaped fruit to 7 mm long and 7 mm wide, disc descending, valves 3 or 4 below the rim.
Embryo type:
Folded.
Seed collecting:
Collect mature fruits that are dark and hard (difficult to break with a finger nail), with the valves un-open any time of year.
Seed cleaning:
Leave the fruits in a breathable container in a dry room for one to two weeks. 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 (soft) and frass (hard) usually distinguishable from each other but can be very similar in shape and colour. 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 germination:
Seeds are non-dormant, viable seed should germinate readily.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
July 201580%7d7d None
1% water agar
12 hrs light / 12 hrs dark  /  20 °C constant
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)