July 19, 2018

Certain native and invasive species produce a photo-toxic sap containing furanocoumarins  within their stems and leaves.  This chemical makes the skin more vulnerable to ultraviolet light, causing hyper sunlight sensitivity (phytophotodermatitus), severe burns and blis...

July 12, 2018

Giant Hogweed (Heracleum mantegazzianum) is a federally listed noxious weed, as well as a phototoxic one.  Its sap, in combination with moisture and sunlight, can cause severe skin irritation, painful blistering, permanent scarring, and if it comes in contact with the...

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