Seeds of South Australia
Eucalyptus oxymitra (Myrtaceae)
Sharp-capped Mallee
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium region:
North Western
NRM region:
Alinytjara Wilurara
IBRA regions
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))
Kintore (GVD04) 
 Least Concern
Tallaringa (GVD05) 
 Data Deficient   [old record]
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern
Watarru (CER02) 
 Least Concern
Everard Block (CER03) 
 Least 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. Oxymitra from the Greek 'oxys' meaning sharp and 'mitra' meaning head-dress; reffering to the sharply pointed bud caps.
Distribution:
Found in the far north-west part of South Australia, growing on red sands on plains and lower parts of dunes, rocky rises and hill slopes in open mallee shrubland. Also found in Western Australia and Northern territory.
Status:
Native. Uncommon in South Australia. Uncommon in the other states.
Plant description:
Multi-stemmed mallee to 6 m high with smooth, pinkish-grey to cream bark throughout sometime with ribbony, rough base. Juvenile leaves ovate, waxy, dull, green to grey-green. Adult leaves to 125 mm long and 40 mm wide, lanceolate to ovate, thickish, dull, blue-green to blue-grey. Flowers in groups of 7 in the axils of the leaves. Buds to 18 mm long and 12 mm wide, waxy, round-shaped to cone-shaped, bud-cap round-shaped with a long point, longer than the base. Flowers cream yellow appearing sporadically after rain.
Fruit type:
Round fruit to 13 mm long and 20 mm wide, waxy when immature, disc ascending, valves 4 or 5, exserted above the rim.
Seed type:
Pale brown irregular pyrimid-shaped seed to 3 mm long and 2 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 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
BGA 
MSB
6933
6933
123-Dec-2003PJA 55
North Western
1-Sep-200495%+5°C, -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 201096%7d17d Stored at -18°C (5 years).
1% w/v agar plates
Incubated under winter conditions
June 200490%14d20d Seed sterilised with 20% Hydrogen Peroxide with 2 drops of Tween (10min). Rinsed in sterile water.
0.8% w/v agar plates
16/8 dark/light  /  20°C Constant
October 200687%14d14d Stored at -18°C (1year).
Wet filter paper placed over wettex sponge. Irrigated with RO water
Incubated under winter conditions
October 200636%42dNA Stored at -18°C (1year).
Wet filter paper placed over wettex sponge. Irrigated with RO water
Incubated under spring/autumn 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)