With all the botany we should not forget the poetry.

Die Schneewurz aus dem Eise
Steigt singend an das Licht

translates: "The *** from the ice rises singing to the light" – here the poet raises the veil a bit; the plant is indeed meant as a metaphor for a singer, or an artist in general.

Back to botany:

Ich bin keine Rose,
Will keine sein

is another clue in favour of Helleborus niger, which, as MudGuard pointed out, is also known as Christrose or Schneerose. "I am not a rose, don't want to be one" – that's what highbrow artists would tell the world, often without being asked, hoping for protest.