Common oak (Quercus robur L.) vector

Common oak (Quercus robur L.) herb vector in PNG and SVG. Clip art, black and white style, outline, all files are transparent, no background.

Quercus robur common oak herb vector in PNG and SVG transparent no background outline black and white


About Common oak (Quercus robur L.) (pedunculate oak, British oak, English oak, European oak, French oak)

An oak (Fagaceae) family tree, 20-40 m tall. It has a straight, tall stem in the forest, but low branches in the open and thick branches. Young shoots are bare. Leaves are oblong-ovate, with 5-7 pairs of lateral lobes and prominent auricles at the base, usually asymmetrical. Flowers are monoecious. Stamens filiform, oblique. The pistillate spikelets and the resulting acorns are pinned together in groups of 1-5 to a common stalk 6-8 (15) cm long. The perianths of the pistillate flowers are pink. The fruit is a 2-4 cm long, oblong-ovate, pointed or obtuse acorn, almost one-third enclosed by a guild. Blooms in May.

Active ingredients. Oak bark contains 10-20% tannins, 1.6% terminal and ellagic acids, 13-14% pentosans, 6% pectin, the flavone quercetin, sugars, phlobaphenes, mucilage and up to 8% minerals. Acorns contain up to 40% starch, 5-8% tannins, up to 5% fat, protein, sugar and minerals. The leaves contain quercitrin, quercetin, pentosans, tannins and minerals.

Preparation. Oak bark (Quercus cortex) and ripe acorns (Quercus semen) are used for medicinal purposes. The bark is peeled without gills from thin (up to 10 cm in diameter) trunks and branches in early spring before leafing out (April-May), making circular cuts at 25-30 cm intervals and 1 or 2 longitudinal cuts. Dry in a sun-protected, well-ventilated room. 1 kg of green bark yields 450-500 g of dry bark. The dried bark should have a smooth, shiny or slightly wrinkled surface and be grey-brown. Stored in wooden crates or bags. Suitable for 4-5 years.

Ripe acorns are harvested in autumn (October-November) without guilds. They are dried in a well-ventilated room and, when half-dried, are finished drying in a hot oven or in a special drying oven at a temperature of not more than 60 °C. When the acorns are dry, the husk is removed, they are split in half and heated in a frying pan for 3-5 minutes. The dried acorn halves must be convex and furrowed on the outside and flat, slightly sunken, light or dark brown, odourless, with a sweetish, bitter, astringent taste on the inside. Stored in tightly sealed glass or ceramic containers. Suitable for consumption for 1 year.

Use. Oak preparations are used as astringents, anti-inflammatory and decay inhibiting agents. Oak bark decoction is used in cases of inflammation (oral mucosa, gums, pharynx, palate, intestinal mucosa), as well as to stop gastrointestinal bleeding, to treat burns, frostbite, abscesses and other skin diseases. The decoction is used to wash a scaly head and sweaty feet. Oak acorn coffee is drunk when the body is weakened after illness. The decoction of acorn powder is drunk for rickets, anaemia, diabetes mellitus.

Contraindications. Oak preparations are not used in haemorrhoids. Prolonged rinsing of the mouth with a decoction of oak bark impairs the sense of smell.

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