Mark wrote "The 'Y' spelling was originally an error by Pourret's (1788) artist,continued by Ker (1802 and 05), and finally corrected in 1955 by Lawrence." Mark, that's interesting, but I wonder if there is more to the story. For instance, you can see the cover page of La Peyrouse's Histoire Abrégrée des Plantes des Pyrénées here: http://books.google.com/books/… And the name is spelled Peyrouse. This was published posthumously. Do you know what the basis was for Lawrence's correction? Jim McKenney