WordNet (r) 3.0 (2006):

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]