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 blistering, skin discoloration, and in some cases it can cause blindness if it gets into the eye. Others can be highly toxic if ingested by humans or animals. If you ingest any toxic plants, seek immediate medical

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 eyes, severe irritation and possible blindness. Contact between the skin and the sap of this plant occurs either through brushing against the bristles on the stem or breaking the stem or leaves. What does it loo