Seeds of South Australia
Sebaea ovata (Gentianaceae)
Yellow Centaury
List of species for Sebaea
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Seed collecting:
October to December
Herbarium regions:
Flinders Ranges, Eastern, Eyre Peninsula, Northern Lofty, Murray, Yorke Peninsula, Southern Lofty, Kangaroo Island, South Eastern
NRM regions:
Adelaide and Mount Lofty Ranges, Eyre Peninsula, Kangaroo Island, Northern and Yorke, South Australian Arid Lands, South Australian Murray-Darling Basin, South East
IBRA regions
SUMMARY
Mount Gambier (SVP02)Southern Volcanic Plain
 Near Threatened   [undercollected, annual]
Bridgewater (NCP01)Naracoorte Coastal Plain
 Least Concern   [undercollected, annual]
Glenelg Plain (NCP02) 
 Near Threatened   [undercollected, annual]
Lucindale (NCP03) 
 Least Concern
Tintinara (NCP04) 
 Least Concern
Kangaroo Island (KAN01)Kanmantoo
 Least Concern
Fleurieu (KAN02) 
 Near Threatened
Mount Lofty Ranges (FLB01)Flinders Lofty Block
 Near Threatened
Broughton (FLB02) 
 Least Concern
Southern Flinders (FLB04) 
 Least Concern
Southern Yorke (EYB01)Eyre Yorke Block
 Least Concern
St Vincent (EYB02) 
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
Eyre Hills (EYB03) 
 Least Concern
Talia (EYB04) 
 Least Concern
Eyre Mallee (EYB05) 
 Rare   (IUCN: RA d(ii))
Murray Mallee (MDD02)Murray Darling Depression
 Rare   (IUCN: RA bd(ii))   (Probable Decline)   [restricted habitat]
Murray Lakes and Coorong (MDD03) 
 Near Threatened   [poss. undercollected ]
Wimmera (MDD05) 
 Rare   (IUCN: RA d(i,ii))
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(i,ii))   [woodland, rocky areas]
Gawler Volcanics (GAW02) 
 Rare   (IUCN: RA d(i,ii))   [no records]
Bimbowrie (BHC05)Broken Hill Complex
 Vulnerable   (IUCN: VU B2ab(i,ii,iii))   (Probable Decline)
IBRA regions
DISPLAY ALL
Mount Gambier (SVP02)Southern Volcanic PlainNear Threatened
  [undercollected, annual]
4 of 4 subregionsNaracoorte Coastal PlainLeast Concern
, Near Threatened
2 of 2 subregionsKanmantooLeast Concern
, Near Threatened
3 of 6 subregionsFlinders Lofty BlockLeast Concern
, Near Threatened
5 of 5 subregionsEyre Yorke BlockLeast Concern
, Rare
, Vulnerable
3 of 6 subregionsMurray Darling DepressionNear Threatened
, Rare
2 of 8 subregionsGawlerRare
Bimbowrie (BHC05)Broken Hill ComplexVulnerable
  (IUCN: VU B2ab(i,ii,iii))   (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 Sebaea]
Name derivation:
Sebaea named after Albertus Seba (1665-1736), a Dutch apothecary and botanist. Ovata from Latin meaning egg-shaped; referring to the shape of the leaves.
Distribution:
Found in the southern part of South Australia, growing in woodland and shrubland on seasonally wet, sandy or gravelly soils, but also in drier, recently burnt sites. Also found in Western Australia, Queensland, New South Wales, Victoria and Tasmania.
Status:
Native. Common in South Australia. Rare in Queensland. Common in the other states.
Plant description:
Erect annual herb to 30 cm high, stem usually simple below inflorescence. Leaves broadly ovate, to 12 mm long and 10 mm wide. Inflorescence in sparse to mid-dense terminal clusters with tubular, yellow flowers. Flowering between September and November.
Fruit type:
Brown ovoid septicidal capsule releasing seeds only through the apex.
Seed type:
Small black diamond-shaped seed to 0.4 mm long and 0.3 mm wide, with deep wrinkles and mesh-like surface.
Embryo type:
Spatulate under-developed.
Seed collecting:
Collect mature capsules as they dry off and turn brown. They should contain hard brown seeds inside.
Seed cleaning:
Place the capsules in a tray for a week. Then rub the capsules with your fingers to dislodge all the seeds. Use a sieve to separate the unwanted material. Be careful as the seeds are very small. 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 two collections, the seed viability were high, at 100%.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Jul-16100%7 d21 d 500 mg/L gibberellic acid 20 h;
1% agar;
Incubated under spring/autumn conditions
Jul-16100%7 d21 d 500 mg/L gibberellic acid 20 h;
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)