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Buckthorn (alder) | | Name : | Buckthorn (alder) | | Botanical : | Rhamnus Frangula | | Synonyms : | Black Dogwood. Frangula Bark. | | Family : | Rhamnaceae | | Parts Used : | Bark. | | Habitat : | The Alder Buckthorn is a slender shrub, widely distributed over Europe and northern Asia, and found in woods and thickets throughout England, though rare in Scotland. | | Description : | It is generally about the same size as the Common Buckthorn, but is distinguished from it by its less bushy and more tree-like habit, by the absence of thorns on its branches and by its larger and entire, not toothed, feather-veined leaves, which are all arranged alternately on the stem, none opposite to one another. The flowers are produced not only from the wood of the preceding year, but also on the shoots of the current year, and have a five-parted calyx, while that of the Common Buckthorn is four-cleft. They bloom in May and are of an inconspicuous green. Their fruit, which is ripe in September, is not unlike that of the Common Buckthorn, but the berry has only two, or at most three, roundish, angular seeds, instead of four. Bees are likewise constant visitors of the flowers of this species, and goats eat the leaves voraciously.
It grows as a rule in leaf-mould in woods comparatively free from lime.
The bark and leaves of the Alder Buckthorn yield a yellow dye much used in Russia; when mixed with salts of iron it turns black. The berries, when unripe, afford a good green colour, readily taken by woollen stuffs; when ripe, they give various shades of blue and grey.
After removal of the bark from the stem and branches, the wood of this shrub is used for making charcoal, yielding a very light, inflammable kind, and being on that account preferred to that of almost any other tree by gunpowder makers, who name it 'Black Dogwood.' In Germany, for the same reason, it is called Pulverholz ('powder-wood'). | | Constituents : | The chemical constituents of Frangula Bark, especially those to which the laxative properties are due, are but imperfectly known. A yellow, crystalline glucoside, Frangulin has been isolated from it. Emodin is present in old bark; this principle is also present in rhubarb root; it is allied to Chrysophane, and is said to result from the glucosic fermentation of Frangulin or Frangulic acid, and to its presence the drug owes its purgative action. Possibly other glucosides are also present and contribute to the laxative action, but the evidence in favour of this assumption is not conclusive. Two resins, resinous bitter matter and a little tannic acid are likewise present in the bark. | | Uses : | Tonic, laxative, cathartic.
Dried seasoned bark from one to twoyears old alone should be used, as the freshlystripped bark acts as an irritant poison on the gastro-intestinal canal. The action of the bark becomes gradually less violent when kept for a length of time and more like that of rhubarb.
It is used as a gentle purgative in cases of chronic constipation and is principally given in the form of the fluid extract, in small doses, repeated three or four times daily, a decoction of 1 OZ. of the bark in 1 quart of water boiled down to a pint, may also be taken in tablespoonful doses. |
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