Seeds of South Australia
Arabidella procumbens (Cruciferae)
Creeping cress
List of species for Arabidella
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Seed collecting:
September to December
Herbarium regions:
Lake Eyre, Gairdner-Torrens, Flinders Ranges, Eastern, Eyre Peninsula
NRM region:
South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Near Threatened   [comes up after rain on clay pans & bare ground]
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))   [southern edge of range]
Braemer (MDD07) 
 Least Concern
Torrens (GAW06)Gawler
 Near Threatened   [comes up after rain on clay pans & bare ground]
Roxby (GAW07) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Curnamona (BHC06)Broken Hill Complex
 Data Deficient
Simpson Desert (SSD02)Simpson Strzelecki Dunefields
 Near Threatened   [comes up after rain on clay pans & bare ground]
Dieri (SSD03) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Warriner (SSD04) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Strzelecki Desert (SSD05) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Breakaways (STP01)Stony Plains
 Near Threatened   [comes up after rain on clay pans & bare ground]
Oodnadatta (STP02) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Murnpeowie (STP03) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Peake-Dennison Inlier (STP04) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Witjira (STP06) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Baltana (STP07) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Sturt Stony Desert (CHC02)Channel Country
 Near Threatened   [comes up after rain on clay pans & bare ground]
Diamantina-Eyre (CHC04) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
Coongie (CHC06) 
 Near Threatened   [comes up after rain on clay pans & bare ground]
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockNear Threatened
  [comes up after rain on clay pans & bare ground]
2 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
2 of 8 subregionsGawlerNear Threatened
Curnamona (BHC06)Broken Hill ComplexData Deficient
4 of 4 subregionsSimpson Strzelecki DunefieldsNear Threatened
6 of 7 subregionsStony PlainsNear Threatened
3 of 4 subregionsChannel CountryNear Threatened
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. Procumbens means to lie on the ground, referring to the species prostrate habit.
Distribution:
Found in the north-eastern part of South Australia growing on claypans and near temporary water. Also found in the Northern Territory, Queensland and New South Wales.
Status:
Native. Common in South Australia. Uncommon in the Northern Territory. Common in the other states.
Plant description:
Multi-stemmed, prostate herb to 15 cm long, glabrous. Basal leaves to 5 cm long, pinnate with 3-7 pairs of lobes with stem leaves reducing towards the tip. Flowers are white or yellow along a short spike. Flowering between July and October.
Fruit type:
Long, brown cylindrical pods.
Seed type:
Tiny yellow semi-flat reniform seed to 0.6 mm long and 0.4 mm wide.
Embryo type:
Bent.
Seed collecting:
Collect pods that are maturing, drying off and turning brown, with yellow seeds inside.
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 rub the pods 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 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
BGA15300 (1.028 g)2-Sep-2008DJD1112
Lake Eyre
20-Jul-2009100%-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
May 20094%21dNA None.
1% water agar supplemented with 250mg/L GA3.
Incubated under spring/autumn conditions
May 20090%NANA None.
1% water agar supplemented with 100mg/L KNO3.
Incubated under spring/autumn conditions
May 20090%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)