Ectypa plantarum ratisbonensium :
Regensburg :Verfertiget und verlegt von Johann Mayr ... und gedruckt mit Zeitlerischen Schriften,1787-1793.
biodiversitylibrary.org/page/59791001
Description: English: Plate 149. Sium suave Walter - Hemlock water-parsnip, Water-parsnip, Water-parsley. Date: 1918. Source: Wild Flowers of New York Part 2, Plate 149. University of the State of New York, State Museum, Albany. Author: 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.
Description: Sium latifolium L. Original Description Merk, Sium latifolium. Date: 1796. Source: Fig. from book Deutschlands Flora in Abbildungen. see http://www.biolib.de. Author: Johann Georg Sturm (Painter: Jacob Sturm).