<i>Berberis vulgaris</i> L. - common barberry
Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 127. Courtesy of Kentucky Native Plant Society. Scanned by Omnitek Inc.
1913
<a rel="nofollow" class="external text" href="https://plants.usda.gov/java/largeImage?imageID=bevu_001_avd.tif">USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern United States, Canada and the British Possessions. 3 vols. Charles Scribner's Sons, New York. Vol. 2: 127.</a>