Sanddune Wallflower (Erysimum capitatum) - Britton-Brown Illustration
%20-%20Britton-Brown%20Illustration.jpg "Sanddune Wallflower (Erysimum capitatum) - Britton-Brown Illustration.jpg")
Britton& Brown Illustrated Flora - 2nd Edition (1913). An Illustrated Flora of the Northern United States and Canada
USDA, NRCS. 2024. The PLANTS Database (http://plants.usda.gov). National Plant Data Team, Greensboro, NC 27401-4901 USA.