This year’s Philadelphia Flower Show opens on Sunday, March 6th and runs until Sunday, March 13th. This year’s theme is Springtime in Paris.
I managed to find a website with a list of flower names in French and English. It’s extensive, and I noticed a few typos, but it seems like a good place to start. The French Wiktionary also has a handful of fleurs en anglais, but it’s a rather short list.
In my hunting on the internet, I also learned about a book called The Common Names of Wildflowers in English and French. Unfortunately, it doesn’t appear to be in print anymore.