noun, masculine/ka.jo/plural: cailleaux
frogfruit, fogfruit (Phyla nodiflora); wild sage, lantana (Lantana camara)
Perhaps from caille (“multi-colored”) + -eau (masculine nominal suffix). The alternative spelling caille-eau may reflect a (probably unetymological) re-interpretation from cailler (“to curdle”) + eau (“water”), giving "water curdler".