Poison ivy

Poison ivy, scientific name Rhus toxicodendron, was a poisonous plant found on Earth.

A Varosian version of the plant existed in the Punishment Dome, contact with its tendrils resulting in instant death. (TV: Vengeance on Varos, PROSE: Vengeance on Varos)

Poison ivy was commonly found in gardens on Earth. It could give humans a rash. Jack Harkness once used a two-year-old playing near poison ivy as a metaphor for humans and alien technology. (PROSE: Slow Decay)