Figure III.  Sweet Flag, Calamus or Flagroot (<i>Acorus americanus</i>  (Raf.) Raf.) as <i>Acorus calamus</i> L.
Homer D. House, New York State Botanist. Walter B. Starr of the Matthews-Northrup Company, Buffalo, and Harold H. Snyder of the Zeese-Wilkinson Company, New York, photographers.
1918
<i>Wild Flowers of New York</i> Part 1, Figure 3. University of the State of New York, State Museum, Albany.