An Etymological Dictionary of the German Language/Bachbunge
Bachbunge, f., ‘speedwell, brooklime' (Veronica beccabunga), from MidHG. bungo, OHG. bunge, ‘bulb'; allied to OIc. bingr, ‘bolster,’ and more remotely with Sans. bahú, ‘dense,’ Gr. παχύς?.