Seeds of South Australia
Eucalyptus repullulans (Myrtaceae)
Chrysoprase Mallee
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium region:
North Western
NRM region:
Alinytjara Wilurara
IBRA region
Mann-Musgrave Block (CER01)Central Ranges
 Vulnerable   (IUCN: VU D2)
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. Repullulans from the Latin 'repullulans' meaning sprouting again; alluding to the mallee habit of this species which distinguishes it from the Western Australian endemic E. striaticalyx , which has a tree habit.
Distribution:
Found in the far north-west corner of South Australia on Dulgunja Hill, growing on rocky hill-slopes with outcropping chrysoprase (a type of quartz that is coloured green by small amounts of nickel). Also found in Western Australia.
Status:
Native. Very rare in South Australia. Uncommon in Western Australia.
Plant description:
Multi-stemmed mallee to 6 m high with smooth, pinkish to pale grey to cream bark throughout. Juvenile leaves ovate, dull, blue-green. Adult leaves to 125 mm long and 30 mm wide, narrow lanceolate to lanceolate, sometime slightly waxy, dull, blue-green. Flowers in groups of 7-9 in axils of the leaves. Buds to 11 mm long and 6 mm wide, waxy, bud-cap round to cone-shaped, ribbed, equal in width or wider than the base. Flowers cream.
Fruit type:
Cup-shaped to slightly bell-shaped fruit to 9 mm long and 9 mm wide, smooth to weakly ribbed, waxy when young, disc descending, valves 3 or 4 at or just below the rim.
Seed type:
Reddish-brown ovoid seed to 3 mm long and 1.5 mm wide, with 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 high, at 100%.
Seed germination:
Seeds are non-dormant, viable seed should germinate readily.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
August 201460%14 d21d None
1% water agar
12 hours  /  20 °C 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)