illustration of <i>Aplectrum hyemale</i> in Britton, N.L., and A. Brown: <i>An illustrated flora of the northern United States, Canada and the British Possessions</i>. Vol. 1: 574.
Britton, N.L., and A. Brown
upload 13-01-2009, published 1913
<a rel="nofollow" class="external free" href="https://plants.usda.gov/gallery/pubs/aphy_001_pvd.tif">http://plants.usda.gov/gallery/pubs/aphy_001_pvd.tif</a>