Seeds of South Australia
Arabidella trisecta (Cruciferae)
Shrubby cress
List of species for Arabidella
Display more images
Click on an image to enlarge it
Seed collecting:
August to December
Herbarium regions:
North Western, 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
SUMMARY
Kangaroo Island (KAN01)Kanmantoo
 Data Deficient   [questionable occurrence, more arid sp]
Broughton (FLB02)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [no recent records]
Olary Spur (FLB03) 
 Least Concern
Southern Flinders (FLB04) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [no recent records]
Northern Flinders (FLB05) 
 Least Concern   [likes rocky outcrops]
Central Flinders (FLB06) 
 Least Concern   [likes rocky outcrops]
Eyre Hills (EYB03)Eyre Yorke Block
 Rare   (IUCN: RA d(i,ii))   (Probable Decline)
South Olary Plain (MDD01)Murray Darling Depression
 Least Concern
Murray Mallee (MDD02) 
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Braemer (MDD07) 
 Least Concern
Murray Scroll Belt (RIV06)Riverina
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Myall Plains (GAW01)Gawler
 Least Concern
Gawler Volcanics (GAW02) 
 Least Concern
Gawler Lakes (GAW03) 
 Least Concern
Arcoona Plateau (GAW04) 
 Least Concern
Kingoonya (GAW05) 
 Least Concern
Torrens (GAW06) 
 Near Threatened
Roxby (GAW07) 
 Least Concern   [likes rocky outcrops]
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(i,ii))
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
Nullarbor Plain (NUL02)Nullarbor
 Least Concern
Yalata (NUL03) 
 Rare   (IUCN: RA d(i,ii))   [limited habitat]
Barrier Range (BHC01)Broken Hill Complex
 Least Concern
Barrier Range Outwash (BHC04) 
 Least Concern
Bimbowrie (BHC05) 
 Least Concern
Curnamona (BHC06) 
 Least Concern
Breakaways (STP01)Stony Plains
 Least Concern   [likes rocky outcrops]
Murnpeowie (STP03) 
 Least Concern   [likes rocky outcrops]
Peake-Dennison Inlier (STP04) 
 Least Concern   [likes rocky outcrops]
Witjira (STP06) 
 Near Threatened
Baltana (STP07) 
 Least Concern   [likes rocky outcrops]
Sturt Stony Desert (CHC02)Channel Country
 Least Concern   [likes rocky outcrops]
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern   [likes rocky outcrops]
Everard Block (CER03) 
 Least Concern   [likes rocky outcrops]
Tieyon (FIN03)Finke
 Near Threatened
IBRA regions
DISPLAY ALL
Kangaroo Island (KAN01)KanmantooData Deficient
  [questionable occurrence, more arid sp]
5 of 6 subregionsFlinders Lofty BlockLeast Concern
, Vulnerable
Eyre Hills (EYB03)Eyre Yorke BlockRare
  (IUCN: RA d(i,ii))   (Probable Decline)
3 of 6 subregionsMurray Darling DepressionLeast Concern
, Rare
Murray Scroll Belt (RIV06)RiverinaRare
  (IUCN: RA d(i,ii))   [edge of range]
7 of 8 subregionsGawlerLeast Concern
, Near Threatened
2 of 4 subregionsGreat Victoria DesertRare
2 of 3 subregionsNullarborLeast Concern
, Rare
4 of 4 subregionsBroken Hill ComplexLeast Concern
5 of 7 subregionsStony PlainsLeast Concern
, Near Threatened
Sturt Stony Desert (CHC02)Channel CountryLeast Concern
  [likes rocky outcrops]
2 of 3 subregionsCentral RangesLeast Concern
Tieyon (FIN03)FinkeNear 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. Trisecta from the Latin 'treis' meaning three and 'sectus' meaning divided, referring to the three-divided leaves.
Distribution:
Found across much of South Australia except on the Yorke Peninsula, Kangaroo Island, southern Mount Lofty Ranges and the South-east, growing in a variety of habitats in disurbed areas, especially on loam, clay or rocky soils. Also found in all mainland states.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Erect woody perennial shrub to 60 cm tall; bright green in appearance. Leaves bi- or trisected to 4 cm long with linear segments. Flowers are white or yellow on a long spike. Flowering between June and October.
Fruit type:
Long brown cylindrical pods on a long spike.
Seed type:
Small yellow semi-flat reniform seeds to 1.2 mm long and 0.7 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
BGA 
MSB
10800 (2.06 g)
10800 (2.06 g)
1528-Aug-2008DJD1148
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 200920%21dNA None.
1% water agar supplemented with 250mg/L GA3.
Incubated under spring/autumn conditions
May 20092%42dNA 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)