Botanical name: 

Fig. 105. Erechtites hieracifolia. Related entry: Oleum Erechtitis.—Oil of Fireweed

The entire plant and oil of Erechtites hieracifolia, Rafinesque (Senecio hieracifolius, Linné.)
Nat. Ord.—Compositae.
COMMON NAME: Fireweed.
ILLUSTRATION: Lloyd's Drugs and Med. of N. A., Vol. II, Plate 38.

Botanical Source.—This plant is the Senecio hieracifolius of Linnaeus. It has an annual herbaceous, grooved, thick, fleshy, branching, virgate panicled, and roughish stem, from 1 to 5 or even 8 feet high. The leaves are simple, alternate, large, lanceolate or oblong, acute, unequally and deeply toothed with acute indentures, sessile, and light-green; the upper ones often have an auricled clasping base. The flowers are greenish, or about the same hue as the plant, terminal, crowded, and destitute of rays. The involucre is smooth, large, tumid, and bristly at the base. The achenia are oblong and hairy (W.—G.).

History and Description.—This is an indigenous, rank weed, growing in fields throughout the United States, in moist woods, and in recent clearings, especially and abundantly in such as have been burned over, hence its vernacular name Fireweed. From the fact of its brittleness and consequent liability to be easily broken, it is seldom found where animals graze. It flowers from August to October, and resembles in appearance the sow-thistle (Sonchus oleraceus); the flowers somewhat resemble those of lettuce. The whole plant is medicinal, and yields its virtues to water or alcohol. It has a peculiar, aromatic, and somewhat fetid odor, very unpleasant to many persons, and a peculiar, slightly pungent, bitterish, rather disagreeable taste, with some astringency. The leaves, which are most generally employed, when dried are almost black, and by this characteristic, as well as by form, may be distinguished from those of Erigeron canadense, or Erigeron annuum, with which they are sometimes confused. The former plant is often erroneously called Fireweed. Erechtites is often incorrectly spelled Erechthites.

Chemical Composition.—The properties of Fireweed appear to reside in a volatile oil (see Oleum Erechtitis), which may be obtained from the plant by distillation with water, and which possesses in an eminent degree the taste and odor of the plant, and which is very persistent

Action, Medical Uses, and Dosage.—Fireweed is reputed to be emetic, cathartic, tonic, astringent, and alterative, of which the most valuable are the latter three. Reputed an unrivaled medicine in diseases of the mucous tissues of the lungs, stomach, and bowels. A spirituous extract of the plant has been highly recommended by Dr. A. R. Wyeth, of Pennsylvania, in the treatment of cholera and dysentery, in the latter disease promptly arresting the muco-sanguineous discharges, relieving pain, and effecting a speedy cure. In the summer-complaint of children, he has found it to prove almost invariably successful, even in cases where other means had failed.

Prof. Roberts Bartholow, at the instance of the authors of Drugs and Medicines of North America, experimented physiologically and therapeutically with true oil of fireweed. He found it to possess the general characteristics of the antiseptic group. It proved to be non-irritant to the stomach, and rather to improve the appetite and digestion. On account of its stimulating effects upon the gastro-intestinal glands, and probably upon the pancreas, an abundant secretion is poured out, rendering the alvine evacuations easy, frequent, and copious, thus proving very useful in habitual constipation, and especially benefiting such cases with acid fermentation and flatulence. He states that "in membraneous enteritis, an affection difficult to cure, it has seemed to be, in a high degree, useful." It first stimulates the heart, dilates the arterioles, and sends a glow of warmth throughout the body. Secondarily, perspiration ensues, the sense of warmth is succeeded by a lowering of temperature, slowing of the pulse, and contraction of the arterioles. Following this is a rise in vascular tension. It is rapidly diffused, absorbed quickly, and quickly excreted, elimination taking place most largely by the lungs, and less so by the kidneys and skin. He concludes that its most important therapeutical action is in disorders of the parts by which it is eliminated, as chronic bronchitis, pulmonic affections, with catarrh of the air tubes, chest neuroses, and coughs of local origin. It may also be used by inhalation. Benefit was derived from its use in genito-urinary catarrh, pyelitis, gleet, cystitis, etc., the drug also allaying nervous irritability. Prof. Bartholow further suggests its value in "sciatica, muscular rheumatism, and cognate affections."

Prof. Hale, on part of the Homoeopaths, gives quite a list of the effects of the oil in tincture, in large doses, and concludes that its action is chiefly upon the vascular system. As oil of fireweed upon the market is generally oil of fleabane, it is very probable that the product used by the Homoeopaths has been the erigeron oil. However, oil of erechtites is considered useful in passive hemorrhages from the kidneys, whether due to "Bright's disease" or other renal disturbances. It has been used also, like oil of erigeron, in epistaxis, hemoptysis, hematemesis, profuse menorrhagia, and hemorrhage from the bowels. According to Hale large doses will increase the menses and bring them on early if used continuously in cold, torpid, phlegmatic individuals. It is a remedy for gonorrhoea, gleet, and gonorrhoeal orchitis. (See Oleum Erechtitis.) Dose, 5 to 10 drops of the oil upon sugar, in emulsion, or in capsules.

Specific Indications and Uses.—Catarrhal states of the mucous membranes; passive hemorrhages; "albuminuria, dropsy, pale, waxy skin, swelling of feet, scanty urine" (Watkin's Comp. of Ec. Med.).

King's American Dispensatory, 1898, was written by Harvey Wickes Felter, M.D., and John Uri Lloyd, Phr. M., Ph. D.