The leaves definitely look just like that of periwinkle. And also Impatiens wallerana is a balsam and the flowers in this photo does not look like that of balsam [ http://en.wikipedia.org/wiki/Impatiens_w... ] , So I also think that it is Periwinkle and not Impatience.
This looks like a Catharanthus flower to me, and especially the leaves which have a prominent light-colored midrib, are ovoid and shiny and have a non-serrated edge. Impatiens leaves seem to be pointed and serrated. http://www.alabamaplants.com/Pinkopp/Catharanthus_roseus_page.html
From what I've read, impatiens are great shade flowers and periwinkles/vincas are sunny area flowers. They do resemble each other and are both annuals.
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