Yucca is a genus of perennial shrubs and trees in the family Asparagaceae, subfamily Agavoideae. Its 40-50 species are notable for their rosettes of evergreen, tough, sword-shaped leaves and large terminal panicles of white or whitish flowers.rom Baja California in the west, northwards into the southwestern United States, through the drier central states as far north as Alberta in Canada (Yucca glauca ssp. albertana). Yucca is also native to the lowlands and dry beach scrub of the Gulf and South Atlantic states from coastal Texas to easternmost Virginia.