Seeds of South Australia
Acacia whibleyana (Leguminosae)
Whibley's Wattle
List of species for Acacia
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Seed collecting:
December to January
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Eyre Hills (EYB03)Eyre Yorke Block
 Critically Endangered   (IUCN: CR A2bc)   (Probable Decline)   [threats: salinity, weeds, galls. Recruitment not good]
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 Acacia]
Name derivation:
Acacia from the Greek 'akakia' and derived from 'ake' or 'akis' meaning a sharp point or thorn and 'akazo' meaning to sharpen. Dioscoride, the Greek physician and botanist used the word in the 1st century AD for the Egyptian thorn tree, Acacia arabica. Whibleyana named after David John Edward Whibley (1936-2002 ), who is remembered by systematists around Australia as a  helpful 'gentle man' of Acacia at Adelaide Herbarium..
Distribution:
Endemic to South Australia and restricted to an area within 40 km of Tumby Bay on southern Eyre Peninsula, growing on loamy soils over limestone, sometimes near brackish swamps.
Status:
Native. Very rare in South Australia.
Plant description:
Dense shrub to 2.5 m tall and spreading to 4 m diameter. Leaves elliptic to oblanceolate to 7.5 mm long and 4.5 mm wide, more or less asymmetric; tip curved to rostriform (beaked), occasionally straight, apiculate(tapered) to the 0.5 mm. Pulvinus (leaf stalk), rigid, thick wrinkled; ascending, mostly straight, occasionally slightly curved, glabrous, dull mid-green. Flower-spike a peduncle (5-11 mm long, 2 per node) with globular, bright-golden heads. Flowering in August.
Fruit type:
Brown narrow-oblong glabrous pod to 45 mm long and 7.5 mm wide, slightly raised over but not constricted between seeds;  margins more or less thickened.
Seed type:
Hard, dark brown to black ovoid seed to 3 mm long and 2.5 mm wide.
Embryo type:
Investing.
Seed collecting:
Collect mature pods that are turning brown, with hard, dark seeds inside.
Seed cleaning:
Place the pods in a tray and leave to dry for 1-2 weeks or until the pods begin to split. Then rub the dried pods to dislodge the seeds. Use a sieve to separate any unwanted material. 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:
This species has physical dormancy that needs to be overcome for the seed to germinate (e.g. nicking or softening the seed coat).
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
5393
5393
1720-Jan-2004MKJ 18
Eyre Peninsula
1-Sep-2004100%+5°C, -18°C
BGA20151820-Jan-2004MKJ 19
Eyre Peninsula
1-Sep-2004100%+5°C, -18°C
BGA128000 (1030 g)21-Dec-2004K. Pobke
Eyre Peninsula
10-Aug-2006-18°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
May 2010100%21d21d Stored at -18°C (5 years). Seed coat nicked with scalpel blade.
0.7% w/v agar plates
Incubated under spring/autumn conditions
June 200499%11d14d Seed sterilised with 20% Hydrogen Peroxide with 3 drops of Tween (10min). Rinsed in sterile water. Seed coat nicked with scalpel blade.
0.8% w/v agar plates
16/8 dark/light  /  20°C Constant
November 200698%14d26d Stored at -18°C (1year). Seed coat nicked with scalpel blade.
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)