Seeds of South Australia
Eucalyptus phenax ssp. compressa (Myrtaceae)
Kangaroo Island White Mallee
List of species for Eucalyptus
Display more images
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium regions:
Southern Lofty, Kangaroo Island
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island
IBRA regions
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [restricted to eastern KI; lots on roadsides; in slow decline due to continued clearance]
Fleurieu (KAN02) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [very restricted; very slow growing/little regeneration; insect attacks; burnt by salt]
Murray Mallee (MDD02)Murray Darling Depression
 Vulnerable   (IUCN: VU D2)   (Probable Decline)   [no recruitment; under threat]
Murray Lakes and Coorong (MDD03) 
 Vulnerable   (IUCN: VU D2)   [edge of range]
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. Phenax from the Greek meaning imposter; alluding to the species being misapplied to E. anceps. Compressa from the Latin 'compressus' meaning pressed together; referring to the relatively crowded fruits compared to E. phenax subsp. phenax.
Distribution:
Endemic to South Australia and found on the eastern side of Kangaroo island and on the Fleurieu Peninsula, growing in mallee vegetation on gravely clays to loams.
Status:
Native. Rare in South Australia.
Plant description:
Multi-stemmed mallee to 7 m high with smooth, coppery to grey to cream bark throughout. Juvenile leaves ovate, dull, green to slightly blue-green. Adult leaves to 140 mm long and 35 mm wide, lanceolate to broad-lanceolate, maturing glossy, green. Flowers in groups of 7-9 in the axils of the leaves, lacking individual stalks. Buds to 13 mm long and 6 mm wide, bud-cap round to cone-shaped equal in width or slightly wider than the base. Flowers creamy-white appearing spring and summer. This subspecies is distinguished from E. phenax ssp. phenax in their distributions, longer peduncles and fruits which are about equal in length and width (longer than wide in E. phenax ssp. phenax).
Fruit type:
Cup-shape to barrel-shaped fruit to 8 mm long and 10 mm wide, lacking individual stalks, disc descending, valves 3-5 level to rim.
Seed type:
Red-brown ovoid seed to 2.5 mm long and 1.5 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 80%.
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
BGA3400 (3.73 g)510-Mar-2010DJD1807
Southern Lofty
Jun-201080%-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.