. . "Trel." . . "Plantae" . . . . . . "Thompson's Yucca" . . . "Asparagales" . "Yucca thompsoniana" . . "Magnoliophyta" . . . "Yucca thompsoniana Trel." . "Agavaceae" . "Liliopsida" . . "Yucca" . . . .