Many plants are highly poisonous when ingested, this is common knowledge. It is remarkable, however, that simply touching certain plants can also be a serious health hazard. Stinging Nettles are rather harmless in this respect, but there are much more dangerous contact-poisonous plants in many parts of the world, especially in the tropics. They can cause severe pain, rashes, blisters or leave scars. Some trees are reported to be so powerful that even raindrops falling from them can irritate the skin. Other plant species can cause blindness through the smoke of burning wood or from rubbing the eyes after touching the leaves. This document gives a concise overview of those contact-poisonous plants that may be of interest for travellers. The first part briefly introduces the active...