Spanish bayonet

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

• noun Any of several yuccas often planted as ornamentals, especially Yucca aloifolia, having a tall woody stem and stiff swordlike pointed leaves.

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

• noun tall yucca of the southwestern United States and Mexico having a woody stem and stiff swordlike pointed leaves and a large cluster of white flowers
• noun a stiff yucca with a short trunk; found in the southern United States and tropical America; has rigid spine-tipped leaves and clusters of white flowers