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Updated: May 17, 2025
Many plants have an intensely irritating action on the skin, and when absorbed act as active poisons. =Rhus toxicodendron= is the poison oak or poison ivy. Poisoning by this plant is rare in England, though not uncommon in the United States. Mere contact with the leaves or branches will in many people set up an acute dermatitis, with much oedema and hyperæmia of the skin.
Although the generality of herbs met with are prepared as above described, yet in such articles as Digitalis, Hyoscyamus, Conium, Toxicodendron, &c., where the quantity necessary for a dose is so small, and so much depends on its action, practitioners are often obliged to prepare it themselves. I shall therefore relate the following mode as the best adapted to that purpose.
"What would you advise, then, in order to prolong our patient's life for a month?" DR. MORGAN. "Give him Rhus!" DR. DOSEWELL. "Rhus, sir! Rhus! I don't know that medicine. Rhus!" Dr. MORGAN. "Rhus Toxicodendron." The length of the last word excited Dr. Dosewell's respect. A word of five syllables, that was something like! He bowed deferentially, but still looked puzzled.
Japan, 1768. This is not often seen planted out, though in not a few places it succeeds perfectly well. It has elegant foliage, each leaf being 15 inches long, and divided into several pairs of leaflets. R. TOXICODENDRON. Poison Oak or Poison Ivy. North America, 1640.
You will remember that the Count had already told me that moving about, especially at night, mitigated his pains; that he contracted his ailment from getting wet; and I noticed that he favored the left leg in walking. These were the three legs for my stool, or prescription. I felt positive that the remedy indicated was Rhus Toxicodendron.
The following "observations accompanying a substance procured near Aden, and used by the Somalis to poison their arrows," by F. S. Arnott, Esq., M.D., will be read with interest. "In February 1853, Dr. Arnott had forwarded to him a watery extract prepared from the root of a tree, described as 'Wabie, a toxicodendron from the Somali country on the Habr Gerhajis range of the Goolies mountains.
The plant is common in our gardens, but their medicinal powers are much weaker than in those from abroad. RHODODENDRON Chrysanthemum. YELLOW-FLOWERED RHODODENDRON. See No. 290. RHUS Toxicodendron. POISON-OAK. Leaves. L. E. Of considerable use in paralytic affections, and is much used in the present day.
"What would you advise, then, in order to prolong our patient's life for a month?" DR. MORGAN. "Give him Rhus!" DR. DOSEWELL. "Rhus, sir! Rhus! I don't know that medicine. Rhus!" Dr. MORGAN. "Rhus Toxicodendron." The length of the last word excited Dr. Dosewell's respect. A word of five syllables, that was something like! He bowed deferentially, but still looked puzzled.
This species is of half-scandent habit, with large, trifoliolate leaves, which turn of various tints of red and crimson in the autumn. It is quite hardy, and seen to best advantage when allowed to run over large rockwork and tree stumps in partial shade. The variety R. toxicodendron radicans has ample foliage, and is suited for similar places to the last.
The third, Grindelia robusta, was used in the treatment of pulmonary troubles, and externally in poisoning from Rhus toxicodendron, or Poison Oak, and in various skin diseases." Their food was of the crudest and simplest character. Whatever they could catch they ate, from deer or bear to grasshoppers, lizards, rats, and snakes.
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