Seeds of South Australia
Eucalyptus microcarpa (Myrtaceae)
Grey Box
List of species for Eucalyptus
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium regions:
Flinders Ranges, Eyre Peninsula, Northern Lofty, Murray, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Tintinara (NCP04)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))   [could be intergrades with odorata and/or wimmerensis]
Southern Flinders (FLB04)Flinders Lofty Block
 Rare   (IUCN: RA b)   (Probable Decline)
St Vincent (EYB02)Eyre Yorke Block
 Critically Endangered   (IUCN: CR D)   (Probable Decline)
Lowan Mallee (MDD04)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [likes heavy clay soils; restricted habitat; lack of recruitment; weedy understorey]
Wimmera (MDD05) 
 Least Concern   (Probable Decline)   [losing paddock trees]
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. Microcarpa from the Greek 'micros' meaning small and 'carpos' meaning fruit; referring to the relatively small fruits of the species.
Distribution:
Found in mainly two disjunct populations in South Australia, in the southern Flinders Ranges and Tothill Range and around Bordertown, growing in grassy box woodland on loam ro clay soils. Also found in Queensland, New South Wales and Victoria.
Status:
Native. Uncommon in South Australia. Common in the other states.
Plant description:
Tree to 25 m tall with rough over whole trunk and to base of larger branches, pale grey, box-type., smooth, whitish above. Juvenile leaves ovate to broadly lanceolate, dull, blue-green or green. Adult leaves to 150 mm long and 25 mm wide, lanceolate, dull to glossy, green. Flowers terminal and axillary in groups of 7, buds to 10 mm long and 4 mm wide, smooth or slightly angular, clavate to ovoid, bud-cap conical equal in length to the base. Flowers white appearing in summer to winter.
Fruit type:
Barrel-shaped fruit to 7 mm long and 5 mm wide, smooth or slightly angular, disc descending, valves 3 or 4 at rim level.
Seed type:
Brown ovoid seed to 1.5 mm long and 1 mm wide, with reticulate 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 low, at 35%.
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
32500 (6.52 g)
32500 (6.52 g)
20+4-Feb-2006KHB051
Northern Lofty
8-Aug-200635%-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
July 201593%7d7d None
1% water agar
12 hrs dark / 12 hrs 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)