New York State county-level distribution map for <i>Calystegia sepium</i> ssp. <i>americana</i>
U. S. Department of Agriculture (USDA), Natural Resources Conservation Service (NRCS)
2013-05-09 22:57:46
<a rel="nofollow" class="external text" href="https://plants.usda.gov/java/">USDA Natural Resources Conservation Service PLANTS Database</a>