rattail cactus

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

• noun A cactus (Disocactus flagelliformis) of Mexico and Central America having thin drooping stems and brilliant dark pink flowers, often cultivated as a houseplant.

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

• noun commonly cultivated tropical American cactus having slender creeping stems and very large showy crimson flowers that bloom for several days