I am a Dutchman who happens to have a (holiday)house in France named "Lavergne". The house next to us was empty and there was a new house built. Then we got the letters adressed to the neighbours. Lavergne was the name of this neighbourhood, several square miles wide with three houses.
They agreed to call my house "Lavergne haut" because it is higher on the hill than the other houses.
There are no streets, the main road has only a number so the addres is zipcode + "lieu dit Lavergne haut" wich Ican be translated to "locally known as Lavergne High".
It belongs to Labouquerie. As you see, names of places starting with "La" (= "the") are written as one word.
There are a lot of neighbourhoods called Lavergne. They are not on the map, you'll find only the official villages. I have a very detailed map on wich I can even see the two old houses and the name La Vergne.
The tree called "vergne" is indeed an alder, but it is masculine.
You say "le vergne" ."La vergne" is wrong.
An old farmer told me that is was an ols french word for vineyard ("la vigne") but he was'nt sure. It was told by his father etc.
Information, pictures and text (Dutch only) is on http://groups.msn.com/Lavergnehaut