The Collaborative International Dictionary of English v.0.48:

Shepherdia \Shep*her"di*a\, n.; pl. Shepherdias. [NL. So
   called from John Shepherd, an English botanist.] (Bot.)
   A genus of shrubs having silvery scurfy leaves, and belonging
   to the same family as Elaeagnus; also, any plant of this
   genus. See Buffalo berry, under Buffalo.
   [1913 Webster]