Seeds of South Australia
Drosera binata (Droseraceae)
Forked Sundew
List of species for Drosera
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Seed collecting:
November to February
Herbarium regions:
Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Endangered   (IUCN: EN D)   [needs water]
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Vulnerable   (IUCN: VU D2)   [(no records) T Horn has records from Honans & Marshes; edge of range]
Lucindale (NCP03) 
 Endangered   (IUCN: EN B2ab(i,ii,iii))   (Probable Decline)
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))
Fleurieu (KAN02) 
 Rare   (IUCN: RA d(ii))   (Probable Decline)   [foot traffic, weeds, changed water extraction - threats]
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Endangered   (IUCN: EN B2ab(i,ii,iii,iv,v))   (Probable Decline)   [1 pop in Cleland CP, also in Mt Bold; foot traffic, weeds, changed water extraction - threats]
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 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. Binata meaning paired; referring to the forked leaves.
Distribution:
Found in the southern Mount Lofty Ranges, on the western end on Kangaroo Island and in the lower South-east in South Australia, growing in wet sand and sandy peat in swamps, on creek banks and seepage lines in rock-faces. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Uncommon in South Australia. Rare in Western Australia. Common in the other States.
Plant description:
Small herb with stems very short; stolons often present. Leaves radical, erect, usually forked once; lobes linear to 10 cm long, with glandular hairs on their upper surfaces; coiled when young; petiole slender to 30 cm long; stipules membranous to 5 mm long. Inflorescence 1 or 2, to 50 cm long; glabrous, branched with 15–30 white flowers. Flowering between December and April.
Fruit type:
Black-brown ovoid capsule to 5 mm long.
Seed type:
Pale-brown linear to narrowly oblong seed to 2 mm long and 0.5 mm wide, with a mesh-like surface.
Seed collecting:
Collect mature capsules, those that are fat, hard, turning brown-black and contain brown 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 90%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA27000 (0.53 g)200+11-Feb-2013KHB835
Southern Lofty
24-Mar-201590%+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
Sep-1428%14 dN/A d
1% agar;
Incubated under spring/autumn conditions
Sep-1412%14 dN/A d 500 mg/L gibberellic acid 48 h;
1% 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)