Yellow Like a Lemon - _TNY_3839
Unlike most Swedish butterflies, the male brimstone butterfly (Gonepteryx rhamni) like this one is quite easy to tell from the female. Most specise don't have a particularily distinct sexual dimorphism, but in these, the male has this yellow tone while the females have a very pale green, almost white colour.
As for the name, as far as I know, English is the only language that associate the yellow colour with brimstone as most other has a name referencing lemon.
Yellow Like a Lemon - _TNY_3839
Unlike most Swedish butterflies, the male brimstone butterfly (Gonepteryx rhamni) like this one is quite easy to tell from the female. Most specise don't have a particularily distinct sexual dimorphism, but in these, the male has this yellow tone while the females have a very pale green, almost white colour.
As for the name, as far as I know, English is the only language that associate the yellow colour with brimstone as most other has a name referencing lemon.