Seeds of South Australia
Calandrinia stagnensis (Portulacaceae)
Waterhole Purslane
List of species for Calandrinia
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Seed collecting:
January to December
Herbarium region:
Lake Eyre
NRM region:
South Australian Arid Lands
IBRA regions
Macumba (STP05)Stony Plains
 Data Deficient   [query ID]
Sturt Stony Desert (CHC02)Channel Country
 Data Deficient   [check ID]
Coongie (CHC06) 
 Rare   (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 Calandrinia]
Name derivation:
Calandrinia named after Jean-Louis Calandrini (1703-1758), a Swiss scientist, professor of mathematics and philosophy. Stagnensis from the Latin 'stagnum' meaning pool, waterhole, referring to the location of the type collection from Ross's Waterhole, Macumba River. 
Distribution:
Found in the north and north-eastern parts of South Australia, growing on temporary freshwater or somewhat saline swamps and claypans and immediate fringes, Chenopod-rich plains, and intermittent watercourses and run-on areas. Also found in Western Australia, Northern Territory and Queensland.
Status:
Native. Uncommon in South Australia. Common in the other states.
Plant description:
Prostrate to decumbent annual herb with stems to 10 cm long. Leaves basal and on flower depending on rain.
Fruit type:
Brown ovoid capsule to 3.5 mm long with 4-valves, exceeding the spreading sepals.
Seed type:
Shiny red-brown reniform seed to 0.4 mm long and 0.3 mm wide, with a smooth surface.
Embryo type:
Peripheral.
Seed collecting:
Collect mature capsules that are turning  brown and contain dark seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for one to two weeks. Then rub the capsules 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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-173%35NA
1% agar;
Incubated under spring/autumn conditions
Jun-170%NANA
1% agar;
Incubated under winter 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)