The Collaborative International Dictionary of English v.0.48:

Alfileria \Al*fil`e*ri"a\, Alfilerilla \Al*fil`e*ril"la\, n.
   [Mex. Sp., fr. Sp. alfiler pin.]
   Same as Alfilaria.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

alfileria
    n 1: European weed naturalized in southwestern United States and
         Mexico having reddish decumbent stems with small fernlike
         leaves and small deep reddish-lavender flowers followed by
         slender fruits that stick straight up; often grown for
         forage [syn: redstem storksbill, alfilaria,
         alfileria, filaree, filaria, clocks, pin grass,
         pin clover, Erodium cicutarium]