Seeds of South Australia
Arabidella glaucescens (Cruciferae)
Bluish cress
List of species for Arabidella
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Seed collecting:
August to December
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Eastern
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Near Threatened
Central Flinders (FLB06) 
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
Gawler Lakes (GAW03)Gawler
 Rare   (IUCN: RA d(i,ii))
Arcoona Plateau (GAW04) 
 Least Concern
Torrens (GAW06) 
 Rare   (IUCN: RA d(ii))
Kintore (GVD04)Great Victoria Desert
 Least Concern
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(i,ii))
Dieri (SSD03)Simpson Strzelecki Dunefields
 Least Concern
Warriner (SSD04) 
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05) 
 Least Concern
Breakaways (STP01)Stony Plains
 Least Concern
Oodnadatta (STP02) 
 Least Concern
Murnpeowie (STP03) 
 Least Concern
Peake-Dennison Inlier (STP04) 
 Least Concern
Macumba (STP05) 
 Least Concern
Witjira (STP06) 
 Least Concern
Baltana (STP07) 
 Least Concern
Sturt Stony Desert (CHC02)Channel Country
 Least Concern
Lake Pure (CHC07) 
 Rare   (IUCN: RA d(ii))
Everard Block (CER03)Central Ranges
 Least Concern
IBRA regions
DISPLAY ALL
2 of 6 subregionsFlinders Lofty BlockNear Threatened
, Rare
3 of 8 subregionsGawlerLeast Concern
, Rare
2 of 4 subregionsGreat Victoria DesertLeast Concern
, Rare
3 of 4 subregionsSimpson Strzelecki DunefieldsLeast Concern
, Rare
7 of 7 subregionsStony PlainsLeast Concern
2 of 4 subregionsChannel CountryLeast Concern
, Rare
Everard Block (CER03)Central RangesLeast Concern
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. Glaucescens from Latin meaning becoming glaucous, alluding to the bluish-green appearance of the plant.
Distribution:
Found in north and north-eastern parts of South Australia growing in a wide variety of habitats, especially disturbed areas. Also found in Northern Territory and Queensland.
Status:
Native. Common in South Australia. Uncommon in the Northern Territory. Common in Queensland.
Plant description:
Woody, rounded perennial shrub to 1 m tall; glabrous with a blue-green appearance. Leaves bi- or trisected to 7 cm long, segments linear. Flowers are white to cream along a long spike. Flowering between June and October.
Fruit type:
Numerous fat semi-flat ovoid pods on a long spike.
Seed type:
Small semi-flat yellow reniform seeds to 1.1 mm long and 0.7 mm wide.
Embryo type:
Bent.
Seed collecting:
Pick off pods that are maturing, drying off and turning brown, with yellow seeds inside or break off section of the spike with mature pods.
Seed cleaning:
Place the pods in a tray and cover with paper to prevent seeds from popping out and leave to dry for a week. Then gently rub the pods 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 three collections the seed viability was high, ranging from 80% to 100%.
Seed germination:
This species has physiological dormancy that need to be overcome for the seed to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
5200 (1.98 g)
2800 (1.05 g)
28-Aug-2008DJD1149
Lake Eyre
20-Jul-2009100%-18°C
BGA7000 (0.64 g)2020-Aug-2010KHB457
Flinders Ranges
1-Jan-201280%-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
July 201146%8dNA None.
1% water agar supplemented with 250mg/L GA3 (pH adjusted to 6.5).
Incubated under winter conditions
July 201112%14dNA None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under winter conditions
July 20114%14dNA None.
1% water agar supplemented with 250mg/L GA3 (pH adjusted to 6.5).
Incubated under spring/autumn conditions
July 20112%14dNA None.
1% water agar.
Incubated under winter conditions
July 20110%NANA None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under spring/autumn conditions
July 20110%NANA None.
1% water agar.
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)