Introduction of Eucalyptus:Blue gum or fever tree.

Popular Herbs. ✵The article gives records of the herb Eucalyptus, its English name, Latin name, common names, property and flavor, its botanical source two plant species, ①.Eucalyptus globulus Labill., with a detailed introduction to the botanical features of this plant species, the growth characteristics, and ecological environment of this plant species, the features of the herb Eucalyptus, its pharmacological actions, medicinal efficacy, and administration guide.

Eucalyptus(Blue gum).

Eucalyptus globulus Labill:leaves English Name: Eucalyptus.
 Latin Name: Eucalyptus globulus Labill.
 Common Names: Blue gum, fever tree, gum tree, Tasmanian blue gum.
 Property and flavor: neutral in nature, tastes pungent and slightly bitter.

 Brief introduction: Eucalyptus globulus is a big tree with a straight trunk, gray-blue bark, beautiful crown, red branches, strange flowers and fruits, it is native to Victoria and Tasmania of Australia, except for garden uses, its leaves and oil have some useful properties for health problems.

 Botanical source: Common herbal classics defined the herb Eucalyptus as the leaves and oil of the species (1). Eucalyptus globulus Labill. It is a plant species of the Eucalyptus genus, the Myrtaceae family. The leaves and oil are used medicinally. This commonly used species is introduced:

(1).Eucalyptus globulus Labill.

 Eucalyptus globulus Labill:growing tree Botanical description: Eucalyptus globulus grows to big trees, the bark is gray-blue, flaky, and peel off, and the twigs are slightly angular. Young leaves are opposite, the leaves are ovate, and the base is heart-shaped, sessile, with white powder; The old leaves are leathery, lanceolate, sickle-shaped, 15~30 cm long, and 1~2 cm wide, with glandular spots on both surfaces. The lateral veins are not obvious, inclined at an angle of 35~40 degrees, and the lateral veins are 1 mm away from the edge; the petiole is 1.5~3 cm long and slightly flat.

 Flowers are large, 4 mm wide, solitary, or 2~3 clustered in leaf axils; Pedicel is absent or extremely short; Calyx tube is an inverted cone, 1 cm long and 1.3 cm wide, and its surface has 4 protruding corners and small strumae, which are covered with white powder; The cap is slightly flat, with a conical protrusion in the middle, shorter than the calyx tube, 2 layers, the outer layer is smooth and fall early; Stamens are 8~13 mm long, multiple rows, slender filaments, anthers are oval; Style is 7~8 mm long, thick and big.

 The capsularfruit is hemispherical, with 4 edges, 2~2.5 cm wide, fruit margin is flat and wide, and fruit petals are unobtrusive.

 Ecological environment: Eucalyptus globulus is native to Victoria and Tasmania of Australia, and grows in warm areas from the coast to 500 meters above sea level. It was introduced to occidental countries in the 19th century, and it is also cultivated in southwest China.

 Growth characteristics: Eucalyptus globulus enjoys strong light, does not tolerate shade, likes warm and humid climates with warm winter and cool summer, can tolerate extreme temperatures of -8 °C and 46 °C (Celsius, or 46.4~114.8 degrees Fahrenheit), has strong wind resistance, and does not tolerate drought. The average annual temperature in the suitable area is 13~19 °C (Celsius, or 55.4~66.2 degrees Fahrenheit), the annual precipitation is 90~1,200 mm, and the soil requirements are not strict, but it does not tolerate strong calcareous soil or strong alkaline soil and waterlogging. This tree species grows best in soil or heavy clay with good drainage, abundant water, and medium fertility, but does not grow well in boron-deficient areas.

 Garden use: Eucalyptus globulus has a straight trunk, beautiful crown, red branches, strange flowers and fruits. Therefore, it is advisable to plant it alone in front of buildings in gardens, and it can be planted on the roadside in front of doors, road greening or patch planting has very good ornamental value. Besides, Eucalyptus globulus has strong resistance to sulfur dioxide and chlorine, and can absorb a lot of harmful gases, so it is a good street tree and greening tree species. Eucalyptus globulus wood is widely used, but it is slightly twisted and has strong corrosion resistance. It is especially suitable for shipbuilding and wharf.

 Pharmacological actions: ①.expectorant; ②.antibacterial and antiviral, antifungal properties; ③.antiseptic property; ④.astringent effect; ⑤.increase flow of blood; ⑥.antitumor; ⑦.antidiabetic; ⑧.muscle relaxing effect, antidiabetic effect, anti-inflammatory effect, antioxidant effect, against mites, etc.

 The herb Eucalyptus is a decongestant and expectorant, it loosens sticky phlegm in the chest so that ut us easier to cough up, and is used in some cough remedy. The herb Eucalyptus has antibacterial and antiviral properties, and it is effective in preventing infection in minor cuts or scrapes, Eucalyptus oil was found against gram-negative bacteria, Escherichia coli, Citrobacter freundii, Enterobacter aerogenes, Klebsiella pneumoniae, Proteus mirabilis, Pseudomonas aeruginosa, Salmonella choleraesuis, Shigella flexneri, etc. Eucalyptus oil has a bactericidal effect against Escherichia coli strain, Eucalyptus oil has antifungal properties against fungi. The herb has antiseptic properties in animal tests. Eucalyptus tea has an astringent and soothing effect on inflammation in the mouth and throat as it contains tannins, astringents constrict tissue, and reduce oozing. Eucalyptus oil increases the flow of blood, so the oil and ointment are used in sore muscle balms. Other studies found the component of Eucalyptus has an antitumor property, antidiabetic effect in animal studies, and it has mental and muscle-relaxing effects and increased cognitive performance, Eucalyptus oil has an anti-inflammatory effect, the antioxidant effect has been identified mainly from its components in stem bark, including taxifolin, rhamnetin, rhamnazin, quercetin, and eriodictyol, these components have greater antioxidant activity than vitamin E. Eucalyptus oil wash destroyed over 99% of blankets infected with mites, and it is effective against mites.

 Medicinal efficacy: Traditionally the leaves and oil were used by Australian Aborigines to reduce fever, coughs and asthma, arthritis, stomach disorders, and skin sores, it was used by traditional Chinese herbalists for ringworm, dysentery, sore muscles, sores of other ailments. Today it is used in herbal remedies for cough, as a topical antiseptic, soothing skin rub for arthritic and other rheumatic pains, and for nasal stuffiness caused by cold or flu, asthma, bronchitis, or croup. Eucalyptus leaf tea is used as a gargle for sore throats and bronchitis, eucalyptus oil is used in foods, alcohol, toothpaste, candies, dentistry agents, soaps, detergents, fragrances, and other products. In Europe, Eucalyptus oil is approved for cough and bronchitis, rheumatism, the oil is used internally and externally for catarrh of the respiratory tract and externally for rheumatic complaints. Eucalyptus leaf is approved for cough and bronchitis, the leaf is used internally as catarrh of the respiratory tract.

 Administration of Eucalyptus (Blue gum): 
Reference: Administration Guide of Eucalyptus (Blue gum)
Herbal classic books: An infusion is prepared using 1 to 2 teaspoons of leaves. A steam inhalation is prepared using a handful of leaves or a few drops of essential oil, the drops can also be added to a vaporizer. For internal use, the average daily dose is 0.3~0.6 grams of Eucalyptus oil, the average daily dose for Eucalyptus leaf is 4~6 grams of the herb, divided up every 3 to 4 hours. Single-dose is 1.5 grams several times a day. The average dose for the tincture is 3~4 grams. Eucalyptus tea dose is 1 cup up to 3 times a day. Eucalyptus should be kept in appropriate, tightly-sealed, non-synthetic containers, different consignments must be stored separately.
 Contraindications, Precautions and Adverse Reactions: When used as recommended, eucalyptus tea and commercial preparations are very safe. However, a large dose of any eucalyptus product can cause nausea, vomiting, diarrhea, or other reactions. Children under two years old should not be given any eucalyptus product, including topical products. Pregnant women should not take eucalyptus. Cough drops and other commercial products contain so little eucalyptus oil that it has no risk, but avoid ingesting the oil in anything other than prepared products because high doses can be very toxic, as little as a teaspoonful or 3.5 ml has been fatal to both children and adults. Topical preparations of the oil have very little risk, but for a few individuals who are sensitive to the plant and might develop a rash, it is not likely to irritate the skin. Never apply eucalyptus preparations to the face of a baby or very young child, the area around the nose may be especially sensitive and eucalyptus could cause a gagging reaction.

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