Seeds of South Australia
Nicotiana occidentalis ssp. obliqua (Solanaceae)
Western Tobacco
List of species for Nicotiana
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Seed collecting:
October to December
Herbarium regions:
North Western, Lake Eyre, Nullarbor, Gairdner-Torrens, Flinders Ranges, Murray
NRM regions:
Alinytjara Wilurara, Eyre Peninsula, South Australian Arid Lands, South Australian Murray-Darling Basin
IBRA regions
SUMMARY
Olary Spur (FLB03)Flinders Lofty Block
 Vulnerable   (IUCN: VU D2)   [rocky outcrops, after fires]
Northern Flinders (FLB05) 
 Near Threatened
South Olary Plain (MDD01)Murray Darling Depression
 Rare   (IUCN: RA d(i,ii))
Myall Plains (GAW01)Gawler
 Rare   (IUCN: RA d(ii))
Gawler Volcanics (GAW02) 
 Least Concern
Kingoonya (GAW05) 
 Rare   (IUCN: RA d(ii))
Maralinga (GVD03)Great Victoria Desert
 Rare   (IUCN: RA d(ii))
Kintore (GVD04) 
 Least Concern
Yellabinna (GVD06) 
 Rare   (IUCN: RA d(ii))
Warriner (SSD04)Simpson Strzelecki Dunefields
 Near Threatened
Breakaways (STP01)Stony Plains
 Near Threatened
Oodnadatta (STP02) 
 Near Threatened
Murnpeowie (STP03) 
 Rare   (IUCN: RA d(ii))
Peake-Dennison Inlier (STP04) 
 Near Threatened
Witjira (STP06) 
 Near Threatened
Baltana (STP07) 
 Near Threatened
Mann-Musgrave Block (CER01)Central Ranges
 Least Concern
Watarru (CER02) 
 Least Concern
Tieyon (FIN03)Finke
 Near Threatened
IBRA regions
DISPLAY ALL
2 of 6 subregionsFlinders Lofty BlockNear Threatened
, Vulnerable
South Olary Plain (MDD01)Murray Darling DepressionRare
  (IUCN: RA d(i,ii))
3 of 8 subregionsGawlerLeast Concern
, Rare
3 of 4 subregionsGreat Victoria DesertLeast Concern
, Rare
Warriner (SSD04)Simpson Strzelecki DunefieldsNear Threatened
6 of 7 subregionsStony PlainsNear Threatened
, Rare
2 of 3 subregionsCentral RangesLeast Concern
Tieyon (FIN03)FinkeNear Threatened
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 Nicotiana]
Name derivation:
Nicotiana named after Jean Nicot (1530-1600), a French Ambassador for the King of France to Lisbon in 1560, who sent the first tobacco plant to France. Occidentalis from Latin meaning western; alluding to the distribution of the species in the western part of Australia. Obliqua from the Latin 'obliquus' meaning oblique; possibly referring to the acutely angled seed.
Distribution:
Found in the northern part of South Australia, growing in sandy or rocky areas, often along creeklines or in shelter of boulders or trees. Also found in Western Australia, Northern Territory, Queensland and New South Wales.
Status:
Native. Common in South Australia. Uncommon in New South Wales. Common in the other states.
Plant description:
Herb to 1.3 m high with dense, sticky grandular hairs. Basal leaves elliptic, to 20 cm long and to 8 cm wide. Stem leaves narrower, the upper ones fiddle-shaped or lanceolate and sessile. Inflorescence erect few branching panicle-like spike with tubular white flowers. Flowering between July and October.
Fruit type:
Brown ellipsoid to ovoid capsule to 14 mm long.
Seed type:
Brown reniform seed to 0.7 mm long and 0.5 mm wide, covered in net-like surface.
Embryo type:
Linear fully developed.
Seed collecting:
Collect mature capsules, those that are brown or turning a pale straw colour and contain brown seeds. Can collect individual capsules or break off the whole fruit spike.
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.
Germination table:
DateResultT0T50Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod
Aug-1590%7 d7 d 501 mg/L gibberellic acid 48 h;
1% agar;
Incubated under spring/autumn conditions
Aug-1588%7 d7 d 500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under winter conditions
Aug-158%7 dNA
1% agar;
Incubated under spring/autumn conditions
Aug-154%7 dNA
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)