<i>Viola pensylvanica</i>.  Rock Creek Park, Washington, DC, USA
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/86548370@N00">Katja Schulz</a> from Washington, D. C., USA
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/treegrow/26222738550/">Smooth Yellow Violet</a>