avens

from WordNet (r) 3.0 (2006)

avens
    n 1: any of various perennials of the genus Geum having usually
         pinnate basal leaves and variously colored flowers

from The Collaborative International Dictionary of English v.0.48

avens \av"ens\ ([a^]v"[e^]nz), n.; pl. {avens}. [OF. avence.]
   (Bot.)
   A plant of the genus {Geum}, of the rose family, esp. {Geum
   urbanum}, or herb bennet. They may bear red, yellow, or white
   flowers.
   [1913 Webster +PJC]