Possible Clues:

• Yucca named by Mormon settlers
• Mojave Desert yucca
• *Desert plant on the back cover of a U2 album
• Yucca that gives its name to a California national park
• Plant unusual feature when leader's gone after kid
• Mojave Desert sight
• Desert plant named for a Biblical spy
• Desert plant for which a U2 album is named
• Indulge in banter with Greek character upset about European plant
• Southwestern national park, or the primary plant that grows there