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Noun: pin grass  pin grãs
  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
    - redstem storksbill, alfilaria, alfileria, filaree, filaria, clocks, pin clover, Erodium cicutarium

Derived forms: pin grasses

Type of: heron's bill, storksbill