Seeds of South Australia
Hibbertia tenuis (Dilleniaceae)
Yundi Guinea-flower
List of species for Hibbertia
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Seed collecting:
January to December
Herbarium region:
Southern Lofty
NRM region:
Adelaide and Mount Lofty Ranges
IBRA region
Fleurieu (KAN02)Kanmantoo
 Critically Endangered   (IUCN: CR B2ab(i,ii,iii,iv,v); D)   (Probable Decline)   [< 50 plants; only known from Yundi; Joe Quarmby has listed this sp.]
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. Tenuis from the Latin 'tenuis' meaning thin, slender; referring to its more delicate and slender habit in comparison to Hibbertia australis.
Distribution:
Endemic to South Australia and found in the vicinity of Mt Compass, growing in low or open vegetation in permanent wet places.
Status:
Native. Very rare in South Australia.
Plant description:
Shrublets with procumbent to scrambling, hairy branches to 50 cm longcovered in hairs. Leaves without axillary tuft of hairs, petiole to 0.5 mm long. Leaves linear, to 12.2 mm long and 1.5 mm wide, obtuse to rounded with abruptly constricted apex of central ridge recurved and scarcely protruding, abruptly constricted into petiole, above convex and puberulous with hairs with 1-3, usually forward-directed branches, below with central ridge much broader than revolute margins and puberulous with muchbranched hairs. Flowers mid to bright yellow, on filiform peduncle to 18 mm long and recurved after flowering, terminal on long and short shoots but usually leaf-opposed due to sympodial growth, with linear or linear-lanceolate bracts. Flowers throughout the year like most species of Hibbertia growing in permanent moist places.
Fruit type:
Brown capsule with 2 carpels , puberulous, recurved with erect styles attached to the dorsal apex.
Seed type:
Red to brown ovoid seed to 2.3 mm  long and 1.5 mm wide.
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 high, at 85%.
Seed germination:
This species has morphophysiological dormancy and can be difficult to germinate.
Seeds stored:
LocationNo. of seeds
(weight grams)
Number
of plants
Date
collected
Collection number
Collection location
Date
stored
% ViabilityStorage
temperature
DJD10411-Jan-2012-18°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
December 201416%35dNA Soak in 400 mg/L GA3 + 20% smoked water for 48 hours
Glass petri dishes containing 25 mL washed sand
Incubated under winter conditions
December 20146%42dNA Soak in 400 mg/L GA3 for 48 hours
Glass petri dishes containing 25 mL washed sand
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
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)