shell-flower

from WordNet (r) 3.0 (2006)

shell-flower
    n 1: showy perennial of marshlands of eastern and central North
         America having waxy lanceolate leaves and flower with lower
         part creamy white and upper parts pale pink to deep purple
         [syn: {shellflower}, {shell-flower}, {turtlehead},
         {snakehead}, {snake-head}, {Chelone glabra}]

from The Collaborative International Dictionary of English v.0.48

Chelone \Che*lo"ne\, n. [Gr. chelw`nh a tortoise. So named from
   shape of the upper lip of the corolla.] (Bot.)
   A genus of hardy perennial flowering plants, of the order
   {Scrophulariace[ae]}, natives of North America; -- called
   also {snakehead}, {turtlehead}, {shellflower}, etc.
   [1913 Webster]

[email protected]