http://woerterbuchnetz.de/DWB/call_wbgui_py_from_form?sigle=DWB&lemid=GS14878&hitlist=&textpattern=&lemmapattern=gon&patternlist=L:gon&mode=Vernetzung says Schneewurz is pinguicul vulgaris, but a common name like Schneewurz could easily apply to two flowers. A sedum is likely to be a far prettier flower - sedums are succulents with showy flowers. That seems to fit the poem better.

It's kinda fun to try google.de when looking up German stuff. It opens a whole new world.

Joe