fluke: a barb on a harpoon or arrow
barb: a subsidiary point facing opposite from the main point that makes an arrowhead or spear hard to remove
myrtales: Myrtaceae; Combretaceae; Elaeagnaceae; Haloragidaceae; Melastomaceae; Lecythidaceae; Lythraceae; Rhizophoraceae; Onagraceae; Lecythidaceae; Punicaceae