Seeds of South Australia
Daviesia asperula ssp. asperula (Leguminosae)
Kangaroo Island Bitter-pea
List of species for Daviesia
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Seed collecting:
November to January
Herbarium regions:
Eyre Peninsula, Kangaroo Island
NRM regions:
Eyre Peninsula, Kangaroo Island
IBRA regions
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
Eyre Hills (EYB03)Eyre Yorke Block
 Rare   (IUCN: RA d(i,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 Daviesia]
Name derivation:
Daviesia named after Rev. Hugh Davies (1739-1821), a Welsh botanist and an Anglican clergyman. Asperula from the Latin 'asper' meaning rough; referring to the slight roughness of the branchlets and phyllodes.
Distribution:
Endemic to South Australia and found mainly on Kangaroo Island with outliers on southern Eyre Peninsula, and a single record from the Fleurieu Peninsula, growing on poor soils of sand or laterite in mallee or open-forest.
Status:
Native. Uncommon in South Australia.
Plant description:
Compact or spreading shrub to 2 m tall, the branchlets greenish, with several longitudinal minutely scabrid ribs. Phyllodes subulate, compressed laterally or subterete, recurved only near the base, to 30 mm long and 1.5 mm wide, tapering from the base into the pungent point. Flower-spike a raceme with 2-3 orange or yellow with a deep-red centred pea-flowers. This subspecies differ from Daviesia asperula ssp. obliqua which has a shorter and broader leaves. Flowering between September and October.
Fruit type:
Brown broad-triangular pod to 14 mm long and 10 mm wide, with one seed inside.
Seed type:
Brown with black mottled globular reniform seed to 6 mm long and 4.5 mm wide, and a cream aril.
Embryo type:
Bent.
Seed collecting:
Collect maturing brown seed pods from the plant using secateurs or by hand. Plant is prickly so it is advisable to wear gloves.
Seed cleaning:
Leave the pods in a paper bag to dry for at least a week. Rub the pods gently with a rubber bung to dislodge the seeds. Use a sieve to separate the seeds from unwanted material. Store the dried fruit heads 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 90%.
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
BGA14261068-Jan-2004MKJ13
Kangaroo Island
1-Sep-2004100%+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
November 2006100%32d46d 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
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
July 201696%14d21d Seed coat nicked and leached in water for 24 hours
1% water agar
Incubated under spring/autumn conditions
March 200492%20d28d 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
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)