The Collaborative International Dictionary of English v.0.48:

Esparcet \Es*par"cet\, n. [F. esparcet, esparcette, ['e]parcet,
   fr. Sp. esparceta, esparcilla.] (Bot.)
   The common sainfoin (Onobrychis sativa), an Old World
   leguminous forage plant.
   [1913 Webster]

WordNet (r) 3.0 (2006):

esparcet
    n 1: Eurasian perennial herb having pale pink flowers and curved
         pods; naturalized in Britain and North America grasslands
         on calcareous soils; important forage crop and source of
         honey in Britain [syn: sainfoin, sanfoin, holy
         clover, esparcet, Onobrychis viciifolia, Onobrychis
         viciaefolia]