Seeds of South Australia
Asterolasia phebalioides (Rutaceae)
Downy Star-bush
List of species for Asterolasia
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Seed collecting:
November to January
Herbarium region:
Kangaroo Island
NRM region:
Kangaroo Island
IBRA region
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU D2)   [fluctuates, responds well to fire; only 1 pop known; disjunct; needs 5yrs before seed is viable; needs disturbance]
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 Asterolasia]
Name derivation:
Asterolasia from the Greek 'aster' meaning star and 'lasios' meaning hairy; referring to the stellate tomentum hairs on the leaves. Phebalioides means resembling the genus Phebalium.
Found in a very small area on the western side of Kangaroo Island in South Australia, growing in open woodland on ironstone and sandy soils. Also found in Victoria.
Native. Very rare in South Australia. Very rare in Victoria.
Plant description:
Small slender shrub to 1.5 m high with densely grey-silvery hairs on branches and leaves. Leaves densely crowded, lacking obvious petioles less than 1 cm long, densely stellate-tomentose hairs particularly on the lower surface. Flowers are small, star-shaped bright yellow, solitary along stems. Flowering between September and December.
Fruit type:
Brown papery capsules with a number of segments, each containing a seed.
Seed type:
Grey to dark brown, mottle bean-like seeds to 2.2 mm long and 1.7 mm wide.
Embryo type:
Linear fully developed.
Seed collecting:
Collect capsules that are turning brown with dark seeds in each segment. Have to keep an eye on the developing capsules as it will split and release the seed quickly. An option is to enclose the developing capsules with a small breathable bag.
Seed cleaning:
Place the capsules in a tray and leave to dry for a week. Then rub the pods with your hands to dislodge the seeds. Use a sieve to separate the 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 viability:
From one collection, the seed viability was high, at 90%. This species has high seed predation.
Seed germination:
This species is generally difficult to germinate, it has morphophysiological dormancy and complex germination requirements.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
6000 (6.05 g)
5000 (5 g)
Kangaroo Island
1-Aug-200790%+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.