WordNet sense 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):

shell-flower, snakehead, snake-head, turtlehead, Chelone glabra

WordNet sense 2 (cultivated for its shining oblong leaves and arching clusters of white flowers with pink shading and crinkled yellow lips with variegated magenta stripes):

shall-flower, Alpinia speciosa, Alpinia Zerumbet, Languas speciosa, shell ginger