Seeds of South Australia
Drosera finlaysoniana (Droseraceae)
Flycatcher
List of species for Drosera
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Seed collecting:
July to September
Herbarium regions:
North Western, Lake Eyre
NRM regions:
Alinytjara Wilurara, South Australian Arid Lands
AVH map:
Australian distribution map (external link)
SA Census:
Census of South Australian plants (external link)     [genus Drosera]
SA Flora:
Flora of South Australia Edition 5
Name derivation:
Drosera from the Greek 'droseros' meaning dewy; alluding to the glistening of the glandular leaf laminae. The name finlaysoniana was initially attached to a herbarium specimen from Vietnam without a description by Wallich in 1828.
Distribution:
Found in the northern part of South Australia, growing in seasonally damp or inundated areas or along watercourses. Also found in all mainland states.
Status:
Native. Common in South Australia. Rare in Victoria. Common in the other states.
Plant description:
Annual herb with fibrous roots, simple stems, to 50 cm long, often lax, green to red, pubescent to glandular-hairy. Leaves on stem, scattered, narrowly linear, acute, to 100 mm long and 6 mm wide, gradually narrowed to a glabrous petiole. Inflorescences terminal, glandular, 3–25-flowered, sepals lanceolate to narrowly oblong, entire to serrulate, glandular; petals cuneate-obovate, pink, orange to white. Flowering between April and August.
Fruit type:
Brown ovoid capsule to 3.5 mm long, erect to spreading.
Seed type:
Black ovoid seed to 0.5 mm long and 0.3 mm wide, with a mesh-like surface
Seed collecting:
Collect mature capsules, those that are fat, hard, turning brown and contain black seeds inside.
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.
Seed viability:
From one collection, the seed viability was high, at 95%.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
July 20110%NANA None
70mm glass petri dishes on 1% w/v agar
Incubated under winter conditions
July 20110%NANA None
70mm glass petri dishes on 1% w/v agar supplemented with 250mg/L Gibberellic acid (pH adjusted to 6.5)
Incubated under winter conditions
July 20110%NANA None
70mm glass petri dishes on 1% w/v agar supplemented with 100mg/L Potassium Nitrate
Incubated under winter conditions
July 20110%NANA None
70mm glass petri dishes on 1% w/v agar supplemented with 100mg/L Potassium Nitrate
Incubated under spring/autumn conditions
July 20110%NANA None
70mm glass petri dishes on 1% w/v agar supplemented with 250mg/L Gibberellic acid (pH adjusted to 6.5)
Incubated under spring/autumn conditions
July 20110%NANA None
70mm glass petri dishes on 1% w/v 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)