| Yucca rupicola Scheele, 1850 |
| Yucca rupicola var. rigida Engelm., 1873 |
| Yucca schidigera Roezl ex Ortgies, 1871 |
| Yucca schottii Engelm., 1873 |
| Yucca schottii var. jaliscensis Trel., 1902 |
| Yucca serratifolia Karw. ex Schult. f., 1830 |
| Yucca serrulata Haw., 1819 |
| Yucca thompsoniana Trel., 1911 |
| Yucca toneliana hort. ex K. Koch, 1863 |
| Yucca torreyi Shafer, 1908 |
| Yucca torreyi f. parviflora McKelvey, 1938 |
| Yucca treculeana Carrière, 1858 |
| Yucca treculeana var. canaliculata (Hook.) Trel., 1902 |
| Yucca treleasei J.F. Macbr., 1918 |
| Yucca valida Brandegee, 1889 |
| Yucca whipplei Torr., 1859 |
| Yucca whipplei subsp. eremica Epling & A.L. Haines, 1957 |
| Yucca whipplei subsp. whipplei Torr., 1859 |
| Yucca whipplei var. graminifolia (Wood) Baker, 1880 |
| Yucca whipplei var. newberry (McKelvey) Hochstätter, 2000 |