Christmas cactus

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of several epiphytic cacti of the genus Schlumbergera, native to Brazil, having jointed flat segments and widely cultivated as houseplants for their showy, usually magenta or red flowers that bloom in winter.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun epiphytic cactus of Brazilian ancestry widely cultivated as a houseplant having jointed flat segments and usually rose-purple flowers that bloom in winter