Seeds of South Australia
Eucalyptus incrassata (Myrtaceae)
Yellow Mallee
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium regions:
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 Murray-Darling Basin, South East
IBRA regions
SUMMARY
Lucindale (NCP03)Naracoorte Coastal Plain
 Least Concern
Tintinara (NCP04) 
 Least Concern
Fleurieu (KAN02)Kanmantoo
 Near Threatened   [common in Monarto CP; edge of range; J Quarmby thinks VUD2]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [only in northern area; localised pop.]
Broughton (FLB02) 
 Rare   (IUCN: RA d(i))   (Probable Decline)
Olary Spur (FLB03) 
 Vulnerable   (IUCN: VU D1+2)
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Least Concern
South Olary Plain (MDD01)Murray Darling Depression
 Least Concern
Murray Mallee (MDD02) 
 Least Concern
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [PLang not sure if in this region]
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))
Yellabinna (GVD06)Great Victoria Desert
 Data Deficient   [Taxonomic issues all records this subregion; Ooldea record wrong ID]
IBRA regions
DISPLAY ALL
2 of 4 subregionsNaracoorte Coastal PlainLeast Concern
Fleurieu (KAN02)KanmantooNear Threatened
  [common in Monarto CP; edge of range; J Quarmby thinks VUD2]
3 of 6 subregionsFlinders Lofty BlockRare
, Vulnerable
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
5 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))   [PLang not sure if in this region]
2 of 8 subregionsGawlerRare
Yellabinna (GVD06)Great Victoria DesertData Deficient
  [Taxonomic issues all records this subregion; Ooldea record wrong ID]
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. Incrassata from the Latin 'incrassatus' meaning thickened; referring to the thick leaves.
Distribution:
Found in the southern part of South Australia, growing on well-drained sandy soils usually overlaying limestone in mallee shrublands. Also found in Western Australia, New South Wales and Victoria.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Multi- or single-stemmed trees to 5 m high with smooth, grey or grey-brown bark, shedding in strips to reveal a paler layer and  rough bark at the base. Juvenile leaves ovate to lanceolate, dull, blue-green soon becoming glossy, green. Adult leaves to 150 mm long and 30 mm wide, alternate, lanceolate, glossy, thick, palish-green. Flowers in groups of 3-7 in the axils of the leaves. Buds to 23 mm long and 11 mm wide, on stalk to 7 mm long, ellipsoid or narrowly obovoid to urn-shaped, faintly striate to ridged, bud-cap cone-shape, equal in length to the base. Flowers cream sometimes aging to pink appearing in winter to summer.
Fruit type:
Thick-walled, barrel-shaped to urn-shape fruit to 18 mm long and 12 mm wide, faintly striate to strongly ribbed, with narrow rim and descending disk, valves 3 or 4 level of or below the rim.
Seed type:
Dark brown to black, irregularly pyramidal seed to 4 mm long and 2.3 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 at least a week. 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 three collections, the seed viability were average to high, ranging from 60% to 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
1378 (1.85 g)
1378
55-Nov-2003PJA 40
Murray
1-Sep-200495%+5°C, -18°C
BGA 
MSB
16500 (50.5 g)
16500 (50.5 g)
30-4020-Oct-2005DJD149
Murray
8-Aug-200695%-18°C
BGA480 (0.48 g)124-Sep-2003PJA 31
Eyre Peninsula
14-Aug-2006-18°C
BGA1525 (6.1 g)116-Sep-2003PJA 23
Murray
14-Aug-2006-18°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
Jun-0482%17 d35 d 20% hydrogen peroxide 10 min, water rinse;
1% agar;
8/16;  /  20°C
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)