Seeds of South Australia
Eucalyptus socialis ssp. eucentrica (Myrtaceae)
Inland Red Mallee
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA region
Breakaways (STP01)Stony Plains
 Rare   (IUCN: RA d(i,ii))   [long -lived]
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. Socialis from the Latin 'socialis ' meaning friendly; alluding to the species being associated with other eucalyptus species. Eucentrica from the Greek 'eu' meaning well and 'kentrikos' meaning of the centre; referring to the species distribution in the interior of Australia. 
Distribution:
Found in the north-west part of South Australia, growing in open mallee vegetation on level to undulating ground on stony or sandy rises. Also found in Western Australia, Northern Territory and Queensland.
Status:
Native. Uncommon in South Australia. Uncommon in Queensland. Common in the other states.
Plant description:
Multi-stemmed mallee to 10 m high with rough, flaky-fibrous, pale grey to grey-brown bark on lower stems and smooth, tan to pinkish-grey to cream bark above. Young branchlets waxy. Juvenile leaves ovate to lanceolate, waxy, dull, blue-green. Adult leaves to 125 mm long and 26 mm wide, lanceolate, dull, blue-green. Flowers in groups of 7-11 in leaf axils. Buds to 13 mm long and 5.5 mm wide, waxy, bud-cap horn-shaped, equal in width and longer than the base. Flower pale, creamy-yellow. This subspecies is distinguished from the other three subspecies that occurs in South Australia by its distribution, having waxy branchlet and buds, dull blue-green adult leaves, medium sized buds and fruits and cream to pale yellow flowers.
Fruit type:
Round to barrel-shaped fruit to 8 mm long and 7.5 mm wide, waxy when young, disc descending, valves 3-5 below rim.
Seed type:
Brown ovoid seed to 2.4 mm long and 1.5 mm wide, with finely reticulated surface.
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 viability:
From one collection, the seed viability was average, at 70%.
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
2571
2571
163-Dec-2003PJA 51
North Western
1-Sep-200480%+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
June 200429%13dNA Seed sterilised with 20% Hydrogen Peroxide with 2 drops of Tween (10min). Rinsed in sterile water.
0.8% w/v agar plates
16/8 dark/light  /  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)