Rhus toxicodendron radicans

McNair JB (1923) Rhus dermatitis from Rhus toxicodendron radicans and diversibola (poison ivy). Its pathology and chemotherapy. University of Chicago Press, Chicago, pp 56-71... 

Allergenic plants causing skin eruption by contact include poison ivy (Rhus radicans L.), poison oak (Rhus toxicodendron L.), poison sumac (Rhus vernix L.), and stinging nettle (Urtica dioica L.). In the United States, poison ivy and poison oak cause nearly 2 million cases of skin poisoning and skin irritation annually, for a loss of 333,000 working days. In addition, these weeds cause 3.7 million days of restricted activity among those people who are susceptible to the toxins (1). 

Poison oak Rhus toxicodendron or Toxicodendron toxicaria Anacardiaceae) is nearly always found as a low-growing shrub, and has lobed leaflets similar to those of oak. It is also common throughout North America. There appears considerable confusion over nomenclature, and Rhus radicans may also be termed poison oak, and R. toxicodendron oakleaf poison ivy. Poison oak contains similar urushiol structures in its sap as poison ivy, though heptadecylcatechols (i.e. C17 side-chains) predominate over pentadecylcatechols (C15 side-chains). 

Pentadecylcatechol is the main allergen of the Ana-cardiaceae poison ivy Toxicodendron radicans) and of poison oak Toxicodendron diversilobay Rhus diversi-loba). 

N.A. Rhus radicans L. R. glabra L. R. toxicodendron L. Toxicodendrol, urushiol, 3-n-pentadecylcatechol.102 Sympathetic stimulant, restore nerve function, facial neuritis, ulcerated sores on the bps, mouth, and nasal membrane. 

Machaerium scleroxylon) in a hobbyist handling the wood. Plants reported to cause erythema multiformelike eruption include poison ivy (Toxicodendron) (Schwartz and Downham 1981 Mallory et al. 1982), primula Primula obconica) (Hjorth 1966) and mug-wort (Artemesia vulgaris) (Kurz and Rapaport 1979). Mallory et al. (1982) reported urticarial eruptions with black deposits on the skin of four patients with Toxidocendron radicans dermatitis. Urticaria, erythema multiforme-like eruptions, in a patient from Rhus dermatitis was reported by Schwartz and Down-ham (1981). They recommended that patients with such reactions should be screened for systemic involvement as previous reports have shown that nephritis can be an associated feature (Meneghini and AngeUni 1981 Fisher 1986). 

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