The American Heritage® Dictionary of the English Language, 4th Edition
n. Any of various plants of the genus Calceolaria native from Mexico to South America and widely cultivated for their showy, speckled, slipper-shaped flowers. Also called slipper flower, slipperwort.
Word Usage
"On the wetter slopes, fields were laid out like checkerboards, lined with eucalyptus and agave, and those that had been left fallow were thick with cosmos and zinnias, helianthus, bidens, and calceolaria, all yellows and golds and reds."