Seeds of South Australia
Eucalyptus calycogona ssp. trachybasis (Myrtaceae)
Red Mallee
List of species for Eucalyptus
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium regions:
Flinders Ranges, Northern Lofty, Murray, Yorke Peninsula, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
Tintinara (NCP04)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(ii))   [edge of range, need more records]
Fleurieu (KAN02)Kanmantoo
 Rare   (IUCN: RA d(ii))
Broughton (FLB02)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2ab(iii))   (Probable Decline)
Southern Flinders (FLB04) 
 Vulnerable   (IUCN: VU B2ab(iii))   (Probable Decline)
Southern Yorke (EYB01)Eyre Yorke Block
 Vulnerable   (IUCN: VU B2ab(iii))   (Probable Decline)   [No recent records; roadside specimens left]
St Vincent (EYB02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern   [survey records missing]
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   [could be missing records]
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. Calycogona from the Greek 'calyx' the calyx and 'gonia' meaning angle; referring to the angular buds and fruit. Trachybasis from the Greek 'trachys' meaning rough and 'basis' meaning base; referring to the rough bark on the lower stems of this subspecies.
Distribution:
Found scattered in mallee shrubland on red-brown loams on Yorke Peninsula, northern Mount Lofty Ranges and the Murray region. Also found in New South Wales and Victoria.
Status:
Native. Uncommon in South Australia..
Plant description:
Multi-stemmed mallee to 8 m tall with rough brown to grey bark on lower stems and smooth grey to cream bark above. Juvenile leaves elliptical to lanceolate, dull, green. Adult leaves lanceolate to 90 mm long and 15 mm wide, shiny green. Flower buds square shape with four longitudinal ribs with bub cap much shorter than the base. Flowers white or rarely pink.
Fruit type:
Woody square fruit with four longitudinal ribs, longer than wide and constricted near the rim.
Seed type:
Light brown ovoid seed to 1.5 mm long and 1 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 two collections, the seed viability were high, ranging from 95% 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
28000 (7.78 g)
26000 (7.17 g)
35+18-Dec-2005KHB018
Murray
11-Aug-200695%-18°C
BGA1800 (0.66 g)518-Dec-2008KHB203
Flinders Ranges
20-Jul-2009100%-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.