illustration of <i>Asarum canadense</i>
Britton, N.L., and A. Brown
1913
<i>An illustrated flora of the northern United States, Canada and the British Possessions</i>. Vol. 1: 643. <a rel="nofollow" class="external text" href="https://plants.usda.gov/java/profile?symbol=ASCA">NRCS Plants Profile</a>