Just had a bit of a Google and it seems it's called Rue in the UK and is an ornamental plant. I had a look for more information and found the below snippet which would indicate to me that it isn't safe:
Rue extracts are mutagenic and hepatotoxic. Large doses can cause violent gastric pain, vomiting, systemic complications, and death.
Exposure to common rue, or herbal preparations derived from it, can cause severe phytophotodermatitis which results in burn-like blisters on the skin