The Collaborative International Dictionary of English v.0.48:

Mitella \Mitella\ prop. n.
   A genus of low slender herbs of North America and Northeast
   Asia having flowers with trifid or pinnatifid petals.

   Syn: genus Mitella.
        [WordNet 1.5] Miter

WordNet (r) 3.0 (2006):

Mitella
    n 1: genus of low slender herbs of North America and
         northeastern Asia having flowers with trifid or pinnatifid
         petals [syn: Mitella, genus Mitella]