Seeds of South Australia
Eucalyptus polybractea (Myrtaceae)
Flinders Ranges Mallee Box
List of species for Eucalyptus
Click on an image to enlarge it
Seed collecting:
January to December
Herbarium region:
Flinders Ranges
NRM region:
South Australian Arid Lands
IBRA region
Southern Flinders (FLB04)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))
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. Polybractea from the Greek 'poly' meaning many and 'bractea' meaning bracts; referring to the numerous bracts around the buds at an early stage of their development.
Distribution:
Found in the northern Flinders Ranges in South Australia, growing on slopes and ridges of rocky hills and ranges in mallee shrubland. Also found in New South Wales and Victoria.
Status:
Native. Rare in South Australia. Rare in the other states.
Plant description:
Multi-stemmed mallee to 8 m high with rough, thin, hard-fibrous, grey to dark grey-brown bark on the lower stems and smooth, coppery to pale grey to cream above. Juvenile leaves linear to narrow-lanceolate, waxy, dull, grey-green. Adult leaves to 160 mm long and 15 mm wide, linear to narrow-lanceolate, sometimes waxy, dull, blue-green to grey-green. Flowers in groups of 7-9 in leaf axils, held erect. Buds to 7 mm long and 4 mm wide, waxy, bud-cap cone-shaped equal in length to the base. Flower white appearing in autumn to spring.
Fruit type:
Barrel-shaped to cup-shaped fruit to 6 mm long and 6 mm wide, waxy, disc descending, valves 4 below the rim.
Seed type:
Orange-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 two collections, the seed viability were high, ranging from 90% 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
BGA790 (0.6 g)6-Jun-2006PJA134
Flinders Ranges
1-Aug-2007100%-18°C
BGA 
MSB
8200 (1.8 g)
8200 (1.8 g)
156-Jul-2006TEE17
Flinders Ranges
1-Aug-200790%-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.