trollius
Concise Oxford English Dictionary © 2008 Oxford University Press:
trollius /ˈtrɒlɪəs/
▶noun (pl. same) a plant of a genus that comprises the globeflowers. [Genus Trollius.]
– origin mod. L., appar. representing Ger. Trollblume ‘globeflower’, from the stem of trollen ‘to roll’ (because of the globular flowers).
'trollius' also found in these Oxford entries:

