Photograph of a blossoming chaparral yucca (Yucca whipplei) with desert terrain in the background, [s.d.]. The flower stands straight at center with a thick, spiny stem and a cluster of tiny, lightly colored blossoms at its top. Tall, thick blades of grass surround the flower's base while small rocks litter the desert ground behind it. Short, dark trees dominate the background.; "The genus Yucca is one of the most remarkable groups of flowering plants native to the New World. It includes about 40 species, most of which occur in the southwestern United States and Mexico. Although they are often associated with arid desert regions, some species are native to the southeastern United States and the Caribbean islands. What truly sets this genus apart from other flowering plants is their unique method of pollination: A specific moth that is genetically programmed for stuffing a little ball of pollen into the cup-shaped stigma of each flower. Like fig wasps and acacia ants, the relationship is mutually beneficial to both partners, and is vital for the survival of both plant and insect. In fact, yuccas cultivated in the Old World, where yucca moths are absent, will not produce seeds unless they are hand pollinated." -- unknown author.