For Pierre Cusson (1727-1783),** French physician, botanist, mathematician and professor at the University of Montpellier, an authority on the carrot family. (Ch)
thursos, = any light straight shaft; commonly the thursus, a wand wreathed in ivy and vine leaves with a pine-cone at the top, carried by devotees of Bacchus;
(thyrse, i.e. a more or less ovoid or ellipsoid panicle, with cymose branches)
flos, floris, = a blossom, flower. (LS, BL, ld)