<i><a href="//commons.wikimedia.org/wiki/Chorispora_tenella" title="Chorispora tenella">Chorispora tenella</a></i>. NPS photo. Cropped from photo collage.
Lee Ferguson
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<a rel="nofollow" class="external free" href="http://www.nps.gov/arch/naturescience/brassicaceae_chorispora_tenella.htm">http://www.nps.gov/arch/naturescience/brassicaceae_chorispora_tenella.htm</a>