Blue-green tobacco

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Blue-green tobacco
Blue-green tobacco

Blue-green tobacco

Systematics
Asterids
Euasterids I
Order : Nightshade (Solanales)
Family : Nightshade family (Solanaceae)
Genre : Tobacco ( Nicotiana )
Type : Blue-green tobacco
Scientific name
Nicotiana glauca
Graham

The blue-green tobacco ( Nicotiana glauca ), or shrub tobacco or tree tobacco called, is a type of species of tobacco ( Nicotiana ).

features

In contrast to most other tobacco species, blue-green tobacco is a small tree or shrub that can grow up to 6 m high. In old age, the plants are very bald.

The blue-green, leathery, egg-shaped and entire-margined leaves are on 3 to 12 cm long petioles, are 5 to 25 cm long, the base of the leaves is blunt to heart-shaped, the tip is blunt or pointed.

The inflorescences are multi-flowered, loose panicles in which the flowers stand on 3 to 12 mm long pedicels. The calyx is tubular and 1 to 1.5 cm long. The corolla lobes are uniform, triangular and pointed. The yellow to red crown is also tubular, has a length of 2.5 to 4.5 cm and has only short corolla lobes. In the tube are the stamens , which are almost the same length. The flowers are slightly protogynous, which means that the stigma is only capable of fertilization a short time after the anthers have opened . About 20 µL of nectar are produced per flower, which attracts hummingbirds as potential pollinators.

The fruits are elliptical, 0.7 to 1.5 cm large capsules , in which there are a few hundred brown seeds with a size of about 0.5 mm.

The number of chromosomes is 2n = 24.

Blue-green tobacco ( Nicotiana glauca )

distribution

The blue-green tobacco originally comes from Bolivia and Argentina , but is now naturalized in almost all tropical and subtropical areas of the world.

In the Mediterranean area it is a type of open ruderal places such as roadsides, rubble sites , etc. It also grows near the coast. Unlike most other types of tobacco, it can withstand light frosts.

ingredients

The blue-green tobacco contains only small amounts of nicotine , but the alkaloids anabasine and nornicotine . It was used less as a stimulant and more as a medicinal plant.

Others

It is sometimes offered as an ornamental plant . Although it is a perennial , most of the time it is grown like an annual because it becomes unsightly afterwards.

Due to its modesty, tree tobacco is being investigated as a possibly suitable plant for the production of biofuels. Tree tobacco can be grown in arid areas on areas that are unsuitable for arable land. This would not compete with food production.

Individual evidence

  1. Zhi-Yun Zhang, Anmin Lu and William D'Arcy: Flora of China. Solanaceae. Vol. 17, 1978.
  2. ^ Sheila K. Schueller: Self-pollination in Island and Mainland Populations of the Introduced Hummingbird-pollinated Plant, Nicotiana glauca (Solanaceae). In: American Journal of Botany Vol. 91, No. 5, pp. 672-681, 2004.
  3. ^ Nicotiana glauca at Tropicos.org. In: IPCN Chromosome Reports . Missouri Botanical Garden, St. Louis
  4. ^ Nicotiana in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved December 2, 2017.
  5. ↑ Cutting- edge research on non-food biofuels. CORDIS news entry as of 24 June 2014, accessed 4 October 2016.

Web links

Commons : Blue-green tobacco ( Nicotiana glauca )  - album with pictures, videos and audio files