dutch case-knife bean

Dutch case-knife bean
    n 1: tropical American bean with red flowers and mottled black
         beans similar to Phaseolus vulgaris but perennial; a
         preferred food bean in Great Britain [syn: {scarlet
         runner}, {scarlet runner bean}, {Dutch case-knife bean},
         {runner bean}, {Phaseolus coccineus}, {Phaseolus
         multiflorus}]