Seeds of South Australia
Hibbertia riparia (Dilleniaceae)
Erect Guinea-flower
List of species for Hibbertia
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Seed collecting:
September to January
Herbarium regions:
Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Kangaroo Island, South East
IBRA regions
Glenelg Plain (NCP02)Naracoorte Coastal Plain
 Rare   (IUCN: RA d(i,ii))   [taxonomic issues, to be renamed]
Lucindale (NCP03) 
 Rare   (IUCN: RA d(ii))   [taxonomic issues, to be renamed]
Tintinara (NCP04) 
 Rare   (IUCN: RA d(ii))   [taxonomic issues, to be renamed]
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
Fleurieu (KAN02) 
 Least Concern
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Least Concern
Eyre Hills (EYB03)Eyre Yorke Block
 Rare   (IUCN: RA d(ii))   [can be confused with H sp Glabriuscula]
Murray Mallee (MDD02)Murray Darling Depression
 Least Concern   [to be renamed H sp Glabriuscula]
Lowan Mallee (MDD04) 
 Least Concern   [to be renamed H sp Glabriuscula]
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))   [taxonomic issues, to be renamed]
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. Riparia from the Latin 'riparius' meaning of a river bank; possible alluding to the habitat where the type specimen was collected.
Distribution:
Found in the southern part of South Australia, growing in a diverse range of habitats. Also found in Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Common in the other states.
Plant description:
Low usually erect shrub or the longer branches drooping to 50 cm high, branchlets closely stellate-pubescent to almost glabrous with scattered minute hairs. Leaves linear often narrowly so, obtuse or subobtuse, to 20 mm long and 2 mm wide, scabrous above and below with simple or stellate hairs or almost glabrous or softly stellate-pubescent, the margins revolute to the broad prominent midrib. Flowers yellow to 2 cm across, sessile or occasionally on peduncles up to 20 mm long, bracts at the base of the calyx usually 0, sometimes a few and usually 1 on the peduncle where this is produced. Flowering between July and November.
Fruit type:
Brown capsule with 2 carpels with 3-6 ovules in each, pubescent.
Seed type:
Brown, globular seed to 2.1 mm diameter.
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. From one collection, the seed viability was average, at 62%.
Seed germination:
This species has morphophysiological dormancy and can be difficult to germinate.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
May 201562%43d89d soak in 500 mg/L gibberellic acid  + 10% smoke water for 48 hrs
1% water agar
Incubated under winter conditions
May 201518%60dNA seed coat nicked
1% water agar
Incubated under winter conditions
December 201416%42dNA Soak in 400 mg/L GA3 + 10% smoked water for 48 hours
Glass petri dishes containing 25 mL washed sand
Incubated under winter conditions
December 201414%56dNA Soak in 400 mg/L GA3 for 48 hours
Glass petri dishes containing 25 mL washed sand
Incubated under winter conditions
May 201512%50dNA soak in 500 mg/L gibberellic acid for 48 hrs
1% water agar
Incubated under winter conditions
December 20140%NANA Leach in RO water for 48 hours
Glass petri dishes containing 25 mL washed sand
Incubated under winter conditions
May 20150%NANA None
1% water 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)