I used Google and searched on pigeonnet apple. Most of the results
were from France but allowed one to click on "Translate this page into
English". I found some interesting sites including some plant
repositories. I suggest that if you want to dig deeper to just go to
the French sites (translated into English of course) and peruse them.
Many have lots of other items inside that you can click on. I did find
"pigeonnet pigshoon" at one of the sites. There seems to be about 9-15
pigeonnet varieties out there. Here are some of the sites I found
interesting.