(h)ydor, (h)yderos, = water of any kind;
(water)
cotule,= a small cup or vessel;
cotulis, = a small cup.
(small cup, anything hollow)
(preferred habitat is damp places and leaf is somewhat cup-shaped) (LS, BL, Le)
For Pierre Cusson (1727-1783),** French physician, botanist, mathematician and professor at the University of Montpellier, an authority on the carrot family. (Ch)