Seeds of South Australia
Eucalyptus angulosa (Myrtaceae)
Southern Ridge-fruited Mallee
List of species for Eucalyptus
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Seed collecting:
January to December
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA regions
Southern Yorke (EYB01)Eyre Yorke Block
 Endangered   (IUCN: EN D)   (Probable Decline)   [Query taxonomy, could be E incrassata]
Eyre Hills (EYB03) 
 Least Concern   [nthn records prob incrassata intergrades]
Talia (EYB04) 
 Rare   (IUCN: RA d(i))
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [likely intergrade; edge of range; could be more 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. Angulosa from the Latin 'angulosus' meaning strongly-angled; referring to the branchlets, buds and fruits with angled sides.
Distribution:
Found on southern Eyre Peninsula in South Australia, growing on white sandy soils over limestone in dense mallee shrubland. Also found in Western Australia.
Status:
Native. Uncommon in South Australia. Common in Western Australia.
Plant description:
Multi-stemmed, usually dense-crowned mallee to 6 m high with smooth, grey or grey-brown bark, shedding in strips to reveal a paler layer, with rough bark at the base. Juvenile leaves ovate to lanceolate, dull and blue-green soon becoming glossy and green. Adult leaves to 140 mm long and 40 mm wide, alternate, on stalk to 20 mm long, lanceolate, glossy, thick, green. Flowers in groups of 3 in axils of the leaves. Buds to 25 mm long and 12 mm wide, urn-shaped, distinctly ribbed, bud-cap cone-shape equal in length to the base. Flowers cream appearing in spring.
Fruit type:
Thick-walled,cup-shaped to cylinder-shaped  fruit to 25 mm long and 25 mm wide, distinctly ribbed, disc descending, valves 3 or 4 below the rim.
Seed type:
Dark brown to black  irregularly pyramidal seed to 4 mm long and 3 mm wide, with angled sides and covered in fine wrinkles.
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 germination:
Seeds are non-dormant, viable seed should germinate readily.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
July 201580%7d7d None
1% water agar
12 hr dark/12 hr light  /  20 °C constant
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)