Seeds of South Australia
Eucalyptus cladocalyx ssp. cladocalyx (Myrtaceae)
Eyre Peninsula Sugar Gum
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
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. Cladocalyx from the Greek 'clados' meaning branch and 'calyx'; alluding to the flowers that occurs on older branchlets below the leafy part of the crown.
Distribution:
Endemic to South Australia and restricted to the southern Eyre Peninsula and a small populations near Cleve, growing in hilly terrain, in gullies and hilltops.
Status:
Native. Uncommon in South Australia.
Plant description:
Single or several-stemmed tree to 18 m tall with smooth bark throughout, orange-yellow to tan, grey and cream. Adult leaves to 140 mm long and 40 mm wide, lanceolate to broad-lanceolate to almost ovate, glossy, dark-green above and paler below. Flowers axillary in umbels of 7-11 flowers. Buds to 10 mm long and 6 mm wide, cylindrical to urn-shaped, bud-cap hemisperical and rounded and much shorther than the bud-base. Flowers cream appearing in summer. This subspecies is distinguished from the other two subspecies by its distribution and combination of lower-growing, spreading and wide-branching habit, relatively short and often broad adult leaves and relatively large fruits.
Fruit type:
Woody, barrel to urn-shaped fruit to 15 mm long and 10 mm wide, smooth or ribbed, disc descending, valves 3 or 4 deeply enclosed below the rim.
Seed type:
Grey-brown ovoid seed to 3 mm long and 2 mm wide.
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 201573%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)