Seeds of South Australia
Hibbertia obtusibracteata (Dilleniaceae)
Prickly Guinea-flower
List of species for Hibbertia
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Seed collecting:
October to December
Herbarium region:
Kangaroo Island
NRM region:
Kangaroo Island
IBRA region
Kangaroo Island (KAN01)Kanmantoo
 Vulnerable   (IUCN: VU B2ab(i,ii,iii,iv); D2)   (Probable Decline)   [endemic to KI; fairly new sp; mostly on roadsides; threatened by roadworks; definitely declining on east end]
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. Obtusibracteata from the Latin 'obtusus'; meaning blunted and 'bractea' meaning thin plate; referring to the obtuse bracts found in this species.
Distribution:
Endemic to South Australia and found only on Kangaroo Island, growing on laterite or often on ironstone in scrub vegetation or mallee heath.
Status:
Native. Rare in South Australia.
Plant description:
Much-branched shrublets with glabrous spreading to decumbent branches to 40 cm long. Tomentum absent except for fine tubercles sometimes on leaf surfaces. Leaves without axillary tufts of hairs. Leaves linear to linear-lanceolate, to 5.6 mm long and 0.75 mm wide, pointed with deciduous terminal bristle on usually slightly incurved protruding central ridge, abruptly constricted into short petioie, above more or less convex, below with raised revolute margins touching broad recessed central ridge. Flowers bright yellow on a long stalk to 19.5 mm long, terminal mainly on short shoots sometimes only with a few reduced leaves followed by an obtuse to rounded bract to 1.6 mm long and on the lower third of the peduncle. Flowering between September to November.
Fruit type:
Capsule with 2 carpels, glabrous.
Seed type:
Brown, globular seed to 2 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.
Seed germination:
This species has morphophysiological dormancy and can be difficult to germinate.