Sentence:  <WSD>Yuccas</WSD> are large, impressive plants with tough, leathery swordlike leaves and towering stalks of white cupshaped flowers. Although they are most abundant in the arid Southwest and on into Mexico, <WSD>yuccas</WSD> also grow in dry sandy spots throughout the East and Midwest. There are about forty species of <WSD>yuccas</WSD>. All have fibers in their leaves, and many serve as soap plants also [...]. 
Meaning of the word marked with <WSD> tags:  Any of several evergreen plants of the genus (Yucca), having long, pointed, and rigid leaves at the top of a woody stem, and bearing a large panicle of showy white blossoms.