Seeds of South Australia
Atriplex incrassata (Chenopodiaceae)
List of species for Atriplex
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Seed collecting:
June to August
Herbarium regions:
Lake Eyre, Gairdner-Torrens, Flinders Ranges
NRM region:
South Australian Arid Lands
IBRA regions
SUMMARY
Northern Flinders (FLB05)Flinders Lofty Block
 Rare   (IUCN: RA d(ii))   [edge of range; almost SA endemic; sparse distribution]
Arcoona Plateau (GAW04)Gawler
 Rare   (IUCN: RA d(i,ii))   [edge of range]
Torrens (GAW06) 
 Rare   (IUCN: RA d(ii))
Roxby (GAW07) 
 Rare   (IUCN: RA d(ii))
Dieri (SSD03)Simpson Strzelecki Dunefields
 Near Threatened
Warriner (SSD04) 
 Rare   (IUCN: RA d(ii))
Strzelecki Desert (SSD05) 
 Rare   (IUCN: RA d(ii))
Breakaways (STP01)Stony Plains
 Rare   (IUCN: RA d(ii))
Oodnadatta (STP02) 
 Rare   (IUCN: RA d(ii))
Murnpeowie (STP03) 
 Rare   (IUCN: RA d(ii))
Peake-Dennison Inlier (STP04) 
 Rare   (IUCN: RA d(ii))
Macumba (STP05) 
 Rare   (IUCN: RA d(ii))
Witjira (STP06) 
 Near Threatened
Baltana (STP07) 
 Rare   (IUCN: RA d(ii))
Sturt Stony Desert (CHC02)Channel Country
 Rare   (IUCN: RA d(ii))
IBRA regions
DISPLAY ALL
Northern Flinders (FLB05)Flinders Lofty BlockRare
  (IUCN: RA d(ii))   [edge of range; almost SA endemic; sparse distribution]
3 of 8 subregionsGawlerRare
3 of 4 subregionsSimpson Strzelecki DunefieldsNear Threatened
, Rare
7 of 7 subregionsStony PlainsNear Threatened
, Rare
Sturt Stony Desert (CHC02)Channel CountryRare
  (IUCN: RA d(ii))
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 Atriplex]
SA Flora:
Flora of South Australia Edition 5
Name derivation:
Atriplex from the Latin 'atriplexum' meaning an orach, a saltbush, an Ancient Latin name for this plant. Incrassata from Latin 'incrassatus' meaning thickened, referring to the thickened fruit base.
Distribution:
Found mainly in South Australia, north of Lake Torrens. Also found in Northern Territory and Queensland.
Status:
Native. Common in South Australia. Rare in other states.
Plant description:
Intricately branched shrub to 1m high. Leaves ovate-deltoid, sinuate-dentate; truncate or slightly cuneate at the base, with a thin scaly covering on both surfaces, with the lamina to 20mm long.  Male flowers in disjunct or continuous glomerules to 5mm wide and forming slender spikes or panicles.  Female flowers in dense disjunct glomerules arranged in open leafy panicles.
Fruit type:
Pale brown papery fruit to 10mm long and wide, with valves smooth, entire or bluntly denticulate; free to near the base, hard, ultimately thickened and convex except for the papery reflexed margin.
Seed type:
Brown reniform seed to 3mm long and 2mm wide.
Embryo type:
Peripheral.
Seed collecting:
Collect fruits that are starting to turn pale brown, drying off and papery. Fruits can be collected directly from the bush or from the ground underneath.
Seed cleaning:
Place the fruits in a tray and leave to dry for one to two weeks. No cleaning is required if only the fruits are collected. The seed can be stored in the fruit or can be clean further. Rub the fruit 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.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
4100 (77.5 g)
4100 (77.5 g)
30+DJD2745
Gairdner-Torrens
24-Mar-201560%-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
September 201460%7d50d Soak in 500 mg/L gibberellic acid for 24 hrs
1% water agar
Incubated under spring/autumn conditions
September 20148%13dNA None
1% water agar
Incubated under spring/autumn conditions
September 20144%43dNA Leach in RO water for 3 days
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)