Seeds of South Australia
Atriplex kochiana (Chenopodiaceae)
Koch's Saltbush
List of species for Atriplex
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Seed collecting:
October to November
Herbarium regions:
Lake Eyre, Gairdner-Torrens, Flinders Ranges
NRM region:
South Australian Arid Lands
IBRA regions
Northern Flinders (FLB05)Flinders Lofty Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [grazed by sheep; habitat degradation]
Gawler Lakes (GAW03)Gawler
 Vulnerable   (IUCN: VU B2ab(i,ii))   (Definite Decline)   [could be extinct]
Arcoona Plateau (GAW04) 
 Vulnerable   (IUCN: VU D2)   [highly localised]
Oodnadatta (STP02)Stony Plains
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [grazed by sheep; habitat degradation]
Baltana (STP07) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)   [grazed by sheep; habitat degradation]
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. Kochiana named after Maxwell "Max" Koch (1854-1925), a German-born Australian botanical collector.
Distribution:
Endemic to South Australia and found only in a few sites around Lake Torrens and Oodnadatta.
Status:
Native. Very rare in South Australia.
Plant description:
Erect rounded annual or short-lived perennial shrub to 40cm high. Leaves thin with a scaly sheen on both surfaces; lamina very broadly obovate; base cuneate. Male flowers in glomerules forming continuous or disjunct slender spikes. Female flowers in axillary clusters.
Fruit type:
Pale-brown papery fruit, sessile or minutely stipitate; united towards the base into a compressed broadly turbinate tube 0.5-1.5 mm high and 1.5-2.5 mm wide at the apex, expanding above into thin appressed prominently veined fan-shaped valves with sinuate margins, 5-8 mm wide and 2.5 mm high; appendages inflated, compressed, ovate to orbicular;, cordate at the base, equal to or exceeding the valves; attached at the apex of the tube of each bracteole by a short stipe.
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
29450 (138.5 g)
16700 (78.57 g)
DJD2744
Gairdner-Torrens
24-Mar-201595%+5°C, -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 201466%7dNA Soak in 500 mg/L gibberellic acid for 24 hours
1% water agar
Incubated under spring/autumn conditions
September 201434%7dNA None
1% water agar
Incubated under spring/autumn conditions
September 201422%7dNA Leach in RO water for three 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)