Western Tobacco
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Regional Species Conservation Assessments per IBRA subregion.
Least concern
Near threatened
Rare
Vulnerable
Endangered
Critically endangered
Extinct
Data deficient
Adelaide
Arkaroola
Ceduna
Coober Pedy
Hawker
Innamincka
Marla
Marree
Mount Gambier
Oodnadatta
Renmark
Wudinna
Keith
Yunta
Display IBRA region text
| 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 |
| 2 of 6 subregions | Flinders Lofty Block | Near Threatened , Vulnerable |
| South Olary Plain (MDD01) | Murray Darling Depression | Rare (IUCN: RA d(i,ii)) |
| 3 of 8 subregions | Gawler | Least Concern , Rare |
| 3 of 4 subregions | Great Victoria Desert | Least Concern , Rare |
| Warriner (SSD04) | Simpson Strzelecki Dunefields | Near Threatened |
| 6 of 7 subregions | Stony Plains | Near Threatened , Rare |
| 2 of 3 subregions | Central Ranges | Least Concern |
| Tieyon (FIN03) | Finke | Near Threatened |
Etymology
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 and status
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. Native. Common in South Australia. Uncommon in New South Wales. Common in the other States.
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
AVH map: SA distribution map (external link)
Plant description
Herb to 1.3 m high with dense, sticky glandular 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. Fruits are brown ellipsoid to ovoid capsule to 14 mm long. Seeds are brown reniform seed to 0.7 mm long and 0.5 mm wide, covered in net-like surface. Seed embryo type is linear, fully-developed.
Seed collection and propagation
Collect seeds between October and December. 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. 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.
| Location | No. of seeds
(weight grams) | Number
of plants | Date
collected | Collection number
Collection location | Date
stored | % Viability | Storage
temperature | BGA
MSB | 90,000 (8.93 g)
90,000 (8.93 g) | 50+ | 25-Sep-2014 | DJD3051
North Western | 1-Jan-2016 | 90% | -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:
Display
| Date | Result | T0 | T50 | Pre-treatment | Germination medium | Incubator: Photoperiod / Thermoperiod |
| Aug-15 | 90% | 7 | 7 |
501 mg/L gibberellic acid 48 h;
1% agar;
Incubated under spring/autumn conditions |
| Aug-15 | 88% | 7 | 7 |
500 mg/L gibberellic acid 48 h;
1% agar;
Incubated under winter conditions |
| Aug-15 | 8% | 7 | NA |
1% agar;
Incubated under spring/autumn conditions |
| Aug-15 | 4% | 7 | NA |
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)
