Seeds of South Australia
Eucalyptus porosa (Myrtaceae)
Black Mallee Box
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium regions:
Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Lucindale (NCP03)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [edge of range]
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Endangered   (IUCN: EN D)   [(no records) on Dudley Peninsula; needs to be listed in Census]
Fleurieu (KAN02) 
 Near Threatened   [J Quarmby thinks VU D2]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened   [as a community would be considered endanagered; clearance a threat in urban areas; J Quarmby: VU D2]
Broughton (FLB02) 
 Least Concern
Olary Spur (FLB03) 
 Least Concern
Southern Flinders (FLB04) 
 Least Concern
Northern Flinders (FLB05) 
 Near Threatened
Central Flinders (FLB06) 
 Least Concern
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Least Concern
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Data Deficient   [1 old record]
Murray Mallee (MDD02) 
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Rare   (IUCN: RA d(ii))   [limited habitat]
Wimmera (MDD05) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Braemer (MDD07) 
 Rare   (IUCN: RA d(i))
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [not typical habitat]
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Least Concern
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(i,ii))
Bimbowrie (BHC05)Broken Hill Complex
 Least Concern
IBRA regions
DISPLAY ALL
2 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Vulnerable
2 of 2 subregionsKanmantooNear Threatened
, Endangered
6 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
5 of 5 subregionsEyre Yorke BlockLeast Concern
6 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
, Vulnerable
, Data Deficient
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))   [not typical habitat]
3 of 8 subregionsGawlerLeast Concern
, Rare
Bimbowrie (BHC05)Broken Hill ComplexLeast Concern
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. Porosa from the Greek 'porosus' meaning pierced with small holes; referring to the microscopic pores in the anthers.
Distribution:
Found in the southern part of South Australia, in semi-arid regions, growing in a variety of habitats on clay over limestone, loamy soils, exposed rocky ridges and coastal limestone bluffs. Also found in New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Multi-stemmed tree or mallee to 14 m high with rough, hard, moderately-fissured, grey-brown to dark grey bark on lower stems and branches and smooth, coppery to grey to cream bark above. Juvenile leaves elliptical to ovate, dull, green. Adult leaves to 130 mm long and 22 mm wide, narrow to broad-lanceolate, glossy, green, dense glands. Flowers in groups of 7 in axils of leaf. Buds to 7 mm long and 5 mm wide, ovoid, smooth, bud-cap cone-shape equal to or slightly shorter than the base. Flowers white or very rarely pink. Flowering between October and March.
Fruit type:
Woody barrel-shaped to cup-shaped fruit to 8 mm long and 8 mm wide, with a narrow rim and descending disk, valves 4 or 5 below the rim.
Seed type:
Reddish-brown ovoid seed to 0.4 mm long and 0.3 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.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
17000 (3.91 g)
17000 (3.91 g)
30+8-Dec-2005DJD310
Gairdner-Torrens
8-Aug-2006100%-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
March 201496%8d17d None
70mm glass petri dishes on 1% w/v agar
Incubated under spring/autumn conditions
March 201496%17d17d None
70mm glass petri dishes on 1% w/v agar
Incubated under winter conditions
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)