Seeds of South Australia
Eucalyptus goniocalyx ssp. exposa (Myrtaceae)
Long-leaf Box
List of species for Eucalyptus
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium region:
Flinders Ranges
NRM region:
South Australian Arid Lands
IBRA region
Central Flinders (FLB06)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [only population in SA; on top of ridges]
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. Goniocalyx from the Greek 'gonia' meaning angle and 'calyx'; referring to the buds and fruits with slightly angled sides. Exposa from the English 'exposed', referring to the exposed habitat of the subspecies on high altitude ridges, and to the fact that until its description, the subspecies had been poorly collected by botanists.
Distribution:
Endemic to South Australia and restricted to the northern Flinders Ranges, growing on the upper slopes of the Elder Ranges and Wilpena Pound Ranges above 900 m altitude.
Status:
Native. Very rare in South Australia.
Plant description:
Several-stemmed tree or mallee to 6 m high with viable bark depending on the size of the plant, smooth on smaller mallee to some rough. thin, dark grey to grey on larger mallee. Juvenile leaves round, greyish and very waxy. Adult leaves to 170 mm long and 20 mm wide, lanceolate to falcate, dull to slightly glossy, blue-green. Flowers in groups of 7 in leaf axils. Buds to 11 mm long and 7 mm wide, slightly angular near base, waxy, bud-cap cone-shaped, equal in length to the base. Flower white. This subspecies is distinguished from Eucalyptus goniocalyx ssp. goniocalyx which has a larger tree habit, more extensive rough bark, larger juvenile and adult leaves and non-waxy branchlets, buds and fruits.
Fruit type:
Cup-shaped to cylinder-shaped fruit to 10 mm long and 10 mm wide, lacking individual stalk, waxy, valves 3 or 4 same level to slightly above rim.
Seed type:
Dark brown to black  ovoid seed to 4 mm long and 2 mm wide, with fined wrinkles.
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 201576%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)