Seeds of South Australia
Stellaria angustifolia (Caryophyllaceae)
Narrow-leaved Swamp Starwort
List of species for Stellaria
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Seed collecting:
December to February
Herbarium regions:
Murray, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, South Australian Murray-Darling Basin, South East
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Stellaria]
Name derivation:
Stellaria from the Latin 'stella' meaning a star and 'aria ' meaning connected with; an allusion to the radiating, deeply bifid petals. Angustifolia from the Latin 'augusta' meaning narrow and 'folium' meaning leaf.
Distribution:
Found in the southern Mount Lofty Ranges, Kangaroo Island and then South-east in South Australia, growing in wet areas amongst grasslands, herblands, sedgelands, lignum thickets in swamps, along watercourses particularly after flooding or underlying in open woodlands and forest. Also found in Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Uncommon in South Australia. Rare in Tasmania. Common in the other states.
Plant description:
Weak trailing perennial herb with 4-angled and glabrous stems. Leaves linear to narrow-lanceolate, to 40 mm long and 1 mm wide, apex obtuse to acute, not rigid,  margins entire to toothed. Flowers solitary or in groups of 3 with white flowers on long stalks. Flowering between October and December.
Fruit type:
Brown ovoid capsule.
Seed type:
Brown reniform seed to 1.3 mm long and 1.1 mm wide, covered in dense wrinkles or net-like surface.
Embryo type:
Peripheral.
Seed collecting:
Collect capsules that are maturing, fat and turning brown and contain hard brown seeds.
Seed cleaning:
Place the capsules in a tray and leave to dry for two weeks. Then rub the capsules gently by hand or with a rubber bung to dislodge the seeds. Use a sieve to separate the unwanted material. Seeds should be hard and brown. 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 two collections, the seed viability were high, ranging from 80% to 100%.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
May-1320%35 dNA 250 mg/L gibberellic acid 48 h;
1% agar;
12/12;  /  20°C
May-1316%21 dNA
1% agar;
12/12;  /  20°C
May-130%NANA 250 mg/L gibberellic acid 48 h;
1% agar;
12/12;  /  10°C
May-130%NANA
1% agar;
16/8;  /  10°C
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)