Seeds of South Australia
Hibbertia hirsuta (Dilleniaceae)
Hairy Guinea-flower
List of species for Hibbertia
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Seed collecting:
November to December
Herbarium region:
Southern Lofty
NRM region:
Adelaide and Mount Lofty Ranges
IBRA region
Fleurieu (KAN02)Kanmantoo
 Critically Endangered   (IUCN: )   (Probable Decline)
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. Hirsuta from the Latin 'hirsutus' meaning hairy, referring to the species being covered in rough, short stiff hairs.
Distribution:
Found along Meadows Creek in South Australia, growing on clay soils on flats near creek line. Also found in Tasmania.
Status:
Native. Very rare in South Australia. Uncommon in Tasmania.
Plant description:
Prostrate to scrambling shrub to 15 cm tall, moderately branched, branches thin ­wiry, with leaf bases scarcely raised and scarcely decurrent, pilose but soon glabrescent, covered on many parts with persistent hairs. Leaves narrowly elliptic to rarely linear, to 6.4 mm long and 1.6 mm wide, gradually tapering into petiole, acute, rarely obtuse, above grooved to incurved and pilose, below exposing a tomentose undersurface between the slightly revolute margins and a narrow central vein, which is often visible to the leaf apex. Flowers small with narrow yellow petals, not showy, petals and stamens one or two. Flowering between September and October. The vegetative part of this species is very similar to other small species of Hibbertia, however, it is easily distinguishable by only having one or two petals and stamens.
Fruit type:
Brown ovoid capsule with two seeds.
Seed type:
Brown, globular seed to 1.5 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:
From one collection, the seed viability was high, at 100%.
Seed germination:
This species has morphophysiological dormancy and can be difficult to germinate.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Dec-1410%42 dNA 400 mg/L gibberellic acid + 20% smoke water 48 h;
moist sand;
Incubated under winter conditions
Dec-146%42 dNA 400 mg/L gibberellic acid 48 h;
moist sand;
Incubated under winter conditions
Dec-140%NANA leached in water 48 h;
moist sand;
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)