Seeds of South Australia
Drosera stricticaulis (Droseraceae)
Erect Sundew
List of species for Drosera
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Seed collecting:
October to December
Herbarium region:
Eyre Peninsula
NRM region:
Eyre Peninsula
IBRA region
Eyre Hills (EYB03)Eyre Yorke Block
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Definite Decline)   [limited habitat, weeds, climate change - threats]
Talia (EYB04) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Definite Decline)   [limited habitat, weeds, climate change - 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. Stricticaulis means upright stems, alluding to the erect flower-stalk.
Distribution:
Found on southern Eyre Peninsula and on Dutchmans Stern in the Flinders Ranges in South Australia, growing on sandy clay, loam along watercourses and granite outcrops. Also found in Western Australia.
Status:
Native. Rare in South Australia. Uncommon in Western Australia.
Plant description:
Perennial, yellow-green herb with a white, generally naked, minutely tuberculate stem tuber with erect stem, annual, usually sparsely branched distally, minutely glandular-hairy. Stem leaves alternate, in clusters of 3, circular, cup-shaped, peltate, to 6 mm diameter. Inflorescence a terminal cymose panicle, 3–14-flowered, sepals narrowly ovate-lanceolate to 8 mm long and 4 mm wide, stalked glandular-hairy; petals broadly obovate, to 12 mm long and 10 mm wide, pink. Flowering between August and November.
Fruit type:
Brown globose capsule, erect and enclosed in persistent sepals.
Seed type:
Black nail-shaped seed to 1.5 mm long, with a wrinkled 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 average, at 70%.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
BGA 
MSB
2750 (0.1356 g)
2750 (0.1356 g)
100+16-Oct-2012JRG27
Eyre Peninsula
27-Feb-201470%-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
June 201336%70dNA None
1% water agar
12 hrs (6 weeks); then 10 hrs (6 weeks)  /  20 °C constant (6 weeks); then 15°C for 20 hrs, 5°C for 4 hrs (6 weeks)
June 201312%70dNA Soak in 250 mg/L gibberellic acid for 4 days
1% water agar
12 hrs (6 weeks); then 10 hrs (6 weeks)  /  20 °C constant (6 weeks); then 15°C for 20 hrs, 5°C for 4 hrs (6 weeks)
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)