Seeds of South Australia
Bergia perennis ssp. obtusifolia (Elatinaceae)
Blunt-leaf Perennial Water-fire
List of species for Bergia
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Seed collecting:
July to November
Herbarium region:
North Western
NRM region:
Alinytjara Wilurara
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Bergia]
Name derivation:
Bergia named after Dr Petter Jonas Bergius (1730-90), Swedish physician and botanist. Perennis from the Latin 'per' meaning through and 'annus' meaning year; referring to the perennial nature of this species. Obtusifolia from the Latin 'obtusus' meaning blunt and 'folium' meaning a leaf; referring to the obtuse leaf apices, a distinguishing feature from the other subspecific taxa of Bergia perennis.
Distribution:
Few record from the north central part of South Australia, growing in sandy or loam soils often in saline areas. Also found in Western Australia and the Northern Territory.
Status:
Native. Uncommon in South Australia. Common in the other states.
Plant description:
Prostrate perennial herb. Indumentum of eglandular hairs or lacking. Leaves elliptic to almost circular, to 10 mm long and 2.25 mm wide, obtuse, margin smooth to inconspicuously serrulate. Stipules to 1.5 mm long. Bracteoles inconspicuous, at base of pedicel, to 1 mm long and 0.25 mm wide. Sepals elliptic to ovate, to 2.5 mm long and 1-2 mm wide, obtuse. Petals to 3.8 mm long and 1.25 mm wide, to twice length of sepals, pink to white. Stamens to 1.75 mm long. Flowering between April and September. This subspecies differ from the other subspecies found in South Australia by having leaf apex acute  (obtuse in B. perennis ssp. exigua) and bracteoles conspicuous, mostly well above base of pedicel obscure at base of pedicel (obscure at base of pedicel in B. perennis ssp. exigua) and sepals mostly less than 1.5 mm long (mostly greater than 1.5 mm long in B. perennis ssp. exigua).
Fruit type:
Globular capsule to 1.5 mm long and 1.5 mm wide.
Embryo type:
Linear.
Seed collecting:
Collect stems with maturing capsules, those that are fat, drying off and contain brown seeds.
Seed cleaning:
Place the stems in a tray and leave to dry for one to two weeks. Then rub the plant especially the capsules gently by hand to dislodge the seeds. Use a fine sieve to separate the unwanted material. Be very careful as the seeds are very small. 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-170%NANA
1% agar;
Incubated under spring/autumn conditions
Jul-170%NANA 500 mg/L gibberellic acid for 24 h;
1% agar;
Incubated under spring/autumn conditions
Jul-170%NANA
1% agar;
Incubated under winter conditions
Jul-170%NANA 500 mg/L gibberellic acid for 24 h;
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)