I would add the photo to the entry for Epilobium canum subsp. garrettii, which is the currently accepted name for the former Zauschneria garrettii, and I would identify the plant as Peach Carpet in the photo caption. That way, if it ever does become a "real" cultivar, it will be easy to find the photo and move it to a new entry.
Garrett's Firechalice (Epilobium canum subsp. garrettii)
