Seeds of South Australia
Arabidella filifolia (Cruciferae)
Rock cress
List of species for Arabidella
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Seed collecting:
October to December
Herbarium regions:
Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
Broughton (FLB02)Flinders Lofty Block
 Endangered   (IUCN: EN B2ab(i,ii,iii); D)   (Definite Decline)   [southern extent]
Olary Spur (FLB03) 
 Endangered   (IUCN: EN B2ab(i,ii,iii); D)   (Probable Decline)
Southern Flinders (FLB04) 
 Endangered   (IUCN: EN B2ab(i,ii,iii); D)   (Probable Decline)
Northern Flinders (FLB05) 
 Near Threatened   [grows on rocky cliffs]
Central Flinders (FLB06) 
 Near Threatened   [grows on rocky cliffs]
St Vincent (EYB02)Eyre Yorke Block
 Rare   (IUCN: RA d(ii))   [Winnanowie south]
Braemer (MDD07)Murray Darling Depression
 Endangered   (IUCN: EN B2ab(i,ii,iii); D)   (Definite Decline)
Myall Plains (GAW01)Gawler
 Near Threatened
Gawler Lakes (GAW03) 
 Rare   (IUCN: RA d(ii))
Arcoona Plateau (GAW04) 
 Rare   (IUCN: RA d(ii))
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))
Nullarbor Plain (NUL02)Nullarbor
 Near Threatened
Barrier Range Outwash (BHC04)Broken Hill Complex
 Endangered   (IUCN: EN B2ab(i,ii,iii); D)
Breakaways (STP01)Stony Plains
 Rare   (IUCN: RA d(ii))   [grows on rocky cliffs]
Peake-Dennison Inlier (STP04) 
 Rare   (IUCN: RA d(ii))   [grows on rocky cliffs]
IBRA regions
5 of 6 subregionsFlinders Lofty BlockNear Threatened
, Endangered
St Vincent (EYB02)Eyre Yorke BlockRare
  (IUCN: RA d(ii))   [Winnanowie south]
Braemer (MDD07)Murray Darling DepressionEndangered
  (IUCN: EN B2ab(i,ii,iii); D)   (Definite Decline)
4 of 8 subregionsGawlerNear Threatened
, Rare
Nullarbor Plain (NUL02)NullarborNear Threatened
Barrier Range Outwash (BHC04)Broken Hill ComplexEndangered
  (IUCN: EN B2ab(i,ii,iii); D)
2 of 7 subregionsStony PlainsRare
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 Arabidella]
Name derivation:
Arabidella a diminutive of 'arabis' which is a Greek word for mustard or cress. Filifolia from the Latin 'filum' meaning thread and 'folium' meaning a leaf, referring to the thread-like leaves.
Endemic to South Australia and found mainly in the central northern region, growing in rocky places.
Native. Uncommon in South Australia.
Plant description:
Erect, much branching, straggling shrub to 1 m tall with thread-like leaves, sometimes splitting into 2s or 3s, to 6 cm long. Flowers are white or cream in terminal clusters. Flowering between August and October.
Fruit type:
Long capsules up to 2 cm long, usually brown when mature and containing numerous seeds.
Seed type:
Yellow-orange semi-flat reniform seeds to 1.2 mm long and 0.7 mm wide.
Embryo type:
Seed collecting:
Collect capsules that are turning brown, with hard yellow seeds inside.
Seed cleaning:
Place the capsules in a tray and cover to prevent seeds popping out and leave to dry for at least a week. Then rub the capsules gently by hand 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 95%.
Seed germination:
This species has physiological dormancy that need to be overcome for the seed to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
of plants
Collection number
Collection location
% ViabilityStorage
16600 (3.66 g)
16600 (3.66 g)
Flinders Ranges
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-1050%4 d30 d
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under spring/autumn conditions
May-1048%4 dNA
1% agar with 250 mg/L gibberellic acid (pH 6.5);
Incubated under winter conditions
May-1038%7 dNA
1% agar with 100 mg/L potassium nitrate;
Incubated under winter conditions
May-1029%4 dNA
1% agar;
Incubated under winter conditions
May-108%4 dNA
1% agar;
Incubated under spring/autumn conditions
May-108%21 dNA
1% agar with 100 mg/L potassium nitrate;
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)