| Toxicodendron
radicans is the scientific name for poison ivy. A skin irritant for most people,
this woody
vine with far-reaching roots creates an itching rash (urushiol-induced contact
dermatitis). Poison ivy is identified by its three leaf clusters. The leaves start
out as bright green and then become darker as they grow. Virginia creeper is often
mistaken for poison ivy (see below image). Both are often found growing together
or in the same area and contain an extensive root system.
Poison ivy is not an ivy but was named so from its resemblance in growth form
to ivy. Poison ivy and poison oak are members of the
sumac family (Anacardiaceae). The plants do not contain a poison but rather a
potent allergenic oil. Oils can be easily transferred from one part of the body
to another, from one person to another, from a pet, or from clothing. North
American natives used the sap from posion ivy to cure warts and it has been used
diluted in homeopathic remedies for musculoskeletal ailments.
A
common saying helps one to remember the general description of the irritant plants,
"leaves of three, let it be".
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