dutchmans-breeches

from The Collaborative International Dictionary of English v.0.48

Dutchman's breeches \Dutchman's breeches\, Dutchman's-breeches
\Dutchman's-breeches\n. (Bot.),
   a delicate perennial spring-flowering herb ({Dicentra
   cucullaria}) of eastern U.S., having peculiar double-spurred
   white flowers. See Illust. of {Dicentra}

   Syn: {Dicentra cucullaria}.
        [1913 Webster + WordNet 1.5]