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 the 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 tip of  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
Jul-1696%14 d21 d seed coat nicked with scalpel, leached in water 24 h;
1% agar;
Incubated under spring/autumn conditions
Mar-0492%20 d28 d 20% hydrogen peroxide 10 min, water rinse, seed coat nicked with scalpel;
1% agar;
8/16;  /  20°C
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)