Those would be poison ivy, poison oak and poison sumac.
if you mean it as in a dichotomous key than it would be pronounced di-cot-o-miss
There are various things that could go wrong when using a dichotomous key. For instance missing essential information would affect the dichotomous key entirely.
A dichotomous key would not identify variations within a species due to environmental factors, as it relies on distinct characteristics for classification.
The scientific or taxonomic name would be Toxicodendron spp.
George Washington. As a fruit of a plant from the deadly nightshade family, they thought it would poison him.
The scientific or taxonomic name would be Eupatorium rugosum.
The scientific or taxonomic name would be Toxicodendron radicans.
The scientific or taxonomic name would be Toxicodendron pubescens.
The scientific or taxonomic name would be Paxillus involutus.
The scientific or taxonomic name would be Toxicodendron vernix.
It somehow seemed inevitable that the dichotomous neighbors would conflict.