Seeds of South Australia
Drosera binata (Droseraceae)
Forked Sundew
List of species for Drosera
Display more images
Click on an image to enlarge it
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 brow 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
September 201428%14dN/Ad None
1% water agar
Incubated under spring/autumn conditions
September 201412%14dN/Ad Soak in 500 mg/L GA3 for 48 hours
1% water 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)