Seeds of South Australia
Hibbertia sericea (Dilleniaceae)
Silky Guinea-flower
List of species for Hibbertia
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Seed collecting:
October to December
Herbarium regions:
Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, Northern and Yorke, South Australian Murray-Darling Basin, South East
IBRA regions
Mount Gambier (SVP02)Southern Volcanic Plain
 Least Concern
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern
Glenelg Plain (NCP02) 
 Least Concern
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Rare   (IUCN: RA d(ii))   [has gone through taxonomic splits]
Fleurieu (KAN02) 
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern   [edge of range]
Murray Lakes and Coorong (MDD03) 
 Least Concern
Lowan Mallee (MDD04) 
 Least Concern
Wimmera (MDD05) 
 Least Concern
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 Hibbertia]
Name derivation:
Hibbertia named after George Hibbert (1757-1837), a London merchant who maintained a private botanic garden at Chelsea. Sericea from the Latin 'sericeus' meaning silky; referring to the softly stellate-tomentose leaves.
Distribution:
Found on southern Yorke Peninsula, Kangaroo Island, Mount Lofty Ranges and the South-east in South Australia, growing on sandy soils associated with mallee woodland. Also found in Queensland, Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Small procumbent to erect shrubs often under 50 cm high. Leaves linear to lanceolate or oblanceolate to 30 mm long and 5 mm wide, silky or softly stellate-tomentose on both surfaces or the upper surface scabrous. Flowers yellow to 30 mm across, terminal or on short branches, petals deeply notched. Flowering in August to December.
Fruit type:
Brown ellipsoid capsule.
Seed collecting:
Collect mature capsules, those that are turning a pale straw colour and contain brown seeds.
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:
This genus tend to have low seed viability.
Seed germination:
This species has morphophysiological dormancy and can be difficult to germinate.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
May-1540%50 dNA 500 mg/L gibberellic acid + 10% smoke water 48 h;
1% agar;
Incubated under winter conditions
May-1526%60 dNA 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under winter conditions
May-1514%60 dNA seed coat nicked with scalpel;
1% agar;
Incubated under winter conditions
May-152%60 dNA
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)