| Yucca aloifolia L. | | a | | Yucca aloifoliaL. | |
| Yucca angustissima Engelm. ex Trel. | | a | | Yucca angustissimaEngelm. ex Trel. | |
| Yucca australis (Engelm.) Trel. | Yucca filifera Chabaud | | | Yucca australis(Engelm.) Trel. | Yucca filiferaChabaud |
| Yucca baccata Torr. | | a | | Yucca baccataTorr. | |
| Yucca baccata Torr. var. australis Engelm. | Yucca filifera Chabaud | | i | Yucca baccataTorr. var.australis Engelm. | Yucca filiferaChabaud |
| Yucca brevifolia Engelm. | | a | | Yucca brevifoliaEngelm. | |
| Yucca draconis L. | Dracaena draco (L.) L. | | | Yucca draconisL. | Dracaena draco(L.) L. |
| Yucca elata Engelm. | | a | | Yucca elataEngelm. | |
| Yucca elephantipes Regel, nom. inval. | Yucca guatemalensis Baker | | | Yucca elephantipesRegel, nom. inval. | Yucca guatemalensisBaker |
| Yucca filamentosa L. | | a | | Yucca filamentosaL. | |
| Yucca flaccida Haw. | | a | | Yucca flaccidaHaw. | |
| Yucca glauca Nutt. | | a | | Yucca glaucaNutt. | |
| Yucca gloriosa L. | | a | | Yucca gloriosaL. | |
| Yucca harrimaniae Trel. | | a | | Yucca harrimaniaeTrel. | |
| Yucca macrocarpa Engelm. | Yucca schottii Engelm. | | | Yucca macrocarpaEngelm. | Yucca schottiiEngelm. |
| Yucca peninsularis McKelvey | Hesperoyucca peninsularis (McKelvey) Clary | | | Yucca peninsularisMcKelvey | Hesperoyucca peninsularis(McKelvey) Clary |
| Yucca parviflora Torr. | Hesperaloe parviflora (Torr.) J. M. Coult. | | | Yucca parvifloraTorr. | Hesperaloe parviflora(Torr.) J. M. Coult. |
| Yucca periculosa Baker | | a | | Yucca periculosaBaker | |
| Yucca rupicola Scheele | | a | | Yucca rupicolaScheele | |
| Yucca whipplei Torr. | Hesperoyucca whipplei (Torr.) Trel. | | | Yucca whippleiTorr. | Hesperoyucca whipplei(Torr.) Trel. |
| Yucca whipplei Torr. subsp. parishii (M. E. Jones) A. L. Haines | Hesperoyucca whipplei (Torr.) Trel. | | i | Yucca whippleiTorr. subsp. parishii (M. E. Jones) A. L. Haines | Hesperoyucca whipplei(Torr.) Trel. |
| Yucca brevifolia Engelm. var. jaegeriana McKelvey | Yucca brevifolia Engelm. | | i | Yucca brevifoliaEngelm. var.jaegeriana McKelvey | Yucca brevifoliaEngelm. |
| Yucca baccata Torr. f. periculosa (Baker) Voss | Yucca periculosa Baker | | i | Yucca baccataTorr. f. periculosa (Baker) Voss | Yucca periculosaBaker |
| Yucca schottii Engelm. | | a | | Yucca schottiiEngelm. | |
| Yucca whipplei Torr. subsp. eremica Epling & A. L. Haines | Hesperoyucca peninsularis (McKelvey) Clary | | i | Yucca whippleiTorr. subsp. eremica Epling & A. L. Haines | Hesperoyucca peninsularis(McKelvey) Clary |
| Yucca spp. | | a | | Yucca spp. | |
| Yucca torreyi Shafer | | a | | Yucca torreyiShafer | |
| Yucca radiosa (Engelm.) Trel. | Yucca elata Engelm. | | | Yucca radiosa(Engelm.) Trel. | Yucca elataEngelm. |
| Yucca angustifolia Pursh var. radiosa Engelm. | Yucca elata Engelm. var. elata | | i | Yucca angustifoliaPursh var.radiosa Engelm. | Yucca elataEngelm. var.elata |
| Yucca schidigera Roezl ex Ortgies | | a | | Yucca schidigeraRoezl ex Ortgies | |
| Yucca guatemalensis Baker | | a | | Yucca guatemalensisBaker | |
| Yucca angustifolia Pursh | Yucca glauca Nutt. | | | Yucca angustifoliaPursh | Yucca glaucaNutt. |
| Yucca whipplei Torr. subsp. newberryi (McKelvey) Hochstätter | Hesperoyucca newberryi (McKelvey) Clary | | i | Yucca whippleiTorr. subsp. newberryi (McKelvey) Hochstätter | Hesperoyucca newberryi(McKelvey) Clary |
| Yucca whipplei Torr. subsp. intermedia A. L. Haines | Hesperoyucca whipplei (Torr.) Trel. | | i | Yucca whippleiTorr. subsp. intermedia A. L. Haines | Hesperoyucca whipplei(Torr.) Trel. |
| Yucca whipplei Torr. subsp. percursa A. L. Haines | Hesperoyucca whipplei (Torr.) Trel. | | i | Yucca whippleiTorr. subsp. percursa A. L. Haines | Hesperoyucca whipplei(Torr.) Trel. |
| Yucca newberryi McKelvey | Hesperoyucca newberryi (McKelvey) Clary | | | Yucca newberryiMcKelvey | Hesperoyucca newberryi(McKelvey) Clary |
| Yucca baileyi Wooton & Standl. | | a | | Yucca baileyiWooton & Standl. | |
| Yucca acrotricha Schiede | Dasylirion acrotrichum (Schiede) Zucc. | | | Yucca acrotrichaSchiede | Dasylirion acrotrichum(Schiede) Zucc. |
| Yucca constricta Buckley | | a | | Yucca constrictaBuckley | |
| Yucca elata Engelm. var. elata | | a | i | Yucca elataEngelm. var.elata | |
| Yucca elata Engelm. var. verdiensis (McKelvey) Reveal | | a | i | Yucca elataEngelm. var.verdiensis (McKelvey) Reveal | |
| Yucca verdiensis McKelvey | Yucca elata Engelm. var. verdiensis (McKelvey) Reveal | | | Yucca verdiensisMcKelvey | Yucca elataEngelm. var.verdiensis (McKelvey) Reveal |
| Yucca angustissima Engelm. ex Trel. var. angustissima | | a | i | Yucca angustissimaEngelm. ex Trel. var.angustissima | |
| Yucca angustissima Engelm. ex Trel. var. avia Reveal | | a | i | Yucca angustissimaEngelm. ex Trel. var.avia Reveal | |
| Yucca angustissima Engelm. ex Trel. var. toftiae (S. L. Welsh) Reveal | | a | i | Yucca angustissimaEngelm. ex Trel. var.toftiae (S. L. Welsh) Reveal | |
| Yucca toftiae S. L. Welsh | Yucca angustissima Engelm. ex Trel. var. toftiae (S. L. Welsh) Reveal | | | Yucca toftiaeS. L. Welsh | Yucca angustissimaEngelm. ex Trel. var.toftiae (S. L. Welsh) Reveal |
| Yucca angustissima Engelm. ex Trel. var. kanabensis (McKelvey) Reveal | | a | i | Yucca angustissimaEngelm. ex Trel. var.kanabensis (McKelvey) Reveal | |
| Yucca kanabensis McKelvey | Yucca angustissima Engelm. ex Trel. var. kanabensis (McKelvey) Reveal | | | Yucca kanabensisMcKelvey | Yucca angustissimaEngelm. ex Trel. var.kanabensis (McKelvey) Reveal |
| Yucca elata Engelm. subsp. verdiensis (McKelvey) Hochstätter | Yucca elata Engelm. var. verdiensis (McKelvey) Reveal | | i | Yucca elataEngelm. subsp. verdiensis (McKelvey) Hochstätter | Yucca elataEngelm. var.verdiensis (McKelvey) Reveal |
| Yucca elata Engelm. subsp. utahensis (McKelvey) Hochstätter | Yucca utahensis McKelvey | | i | Yucca elataEngelm. subsp. utahensis (McKelvey) Hochstätter | Yucca utahensisMcKelvey |
| Yucca utahensis McKelvey | | a | | Yucca utahensisMcKelvey | |
| Yucca angustissima Engelm. ex Trel. subsp. toftiae (S. L. Welsh) Hochstätter | Yucca angustissima Engelm. ex Trel. var. toftiae (S. L. Welsh) Reveal | | i | Yucca angustissimaEngelm. ex Trel. subsp. toftiae (S. L. Welsh) Hochstätter | Yucca angustissimaEngelm. ex Trel. var.toftiae (S. L. Welsh) Reveal |
| Yucca angustissima Engelm. ex Trel. subsp. kanabensis (McKelvey) Hochstätter | Yucca angustissima Engelm. ex Trel. var. kanabensis (McKelvey) Reveal | | i | Yucca angustissimaEngelm. ex Trel. subsp. kanabensis (McKelvey) Hochstätter | Yucca angustissimaEngelm. ex Trel. var.kanabensis (McKelvey) Reveal |
| Yucca angustissima Engelm. ex Trel. subsp. avia (Reveal) Hochstätter | Yucca angustissima Engelm. ex Trel. var. avia Reveal | | i | Yucca angustissimaEngelm. ex Trel. subsp. avia (Reveal) Hochstätter | Yucca angustissimaEngelm. ex Trel. var.avia Reveal |
| Yucca filifera Chabaud | | a | | Yucca filiferaChabaud | |
| Yucca baccata Torr. var. baccata | | a | i | Yucca baccataTorr. var.baccata | |
| Yucca baccata Torr. var. brevifolia L. D. Benson & Darrow | | a | i | Yucca baccataTorr. var.brevifolia L. D. Benson & Darrow | |
| Yucca brevifolia Engelm. subsp. jaegeriana (McKelvey) Hochstätter | Yucca brevifolia Engelm. | | i | Yucca brevifoliaEngelm. subsp. jaegeriana (McKelvey) Hochstätter | Yucca brevifoliaEngelm. |
| Yucca gloriosa L. var. gloriosa | | a | i | Yucca gloriosaL. var.gloriosa | |
| Yucca gloriosa L. var. recurvifolia (Salisb.) Engelm. | | a | i | Yucca gloriosaL. var.recurvifolia (Salisb.) Engelm. | |
| Yucca recurvifolia Salisb. | Yucca gloriosa L. var. recurvifolia (Salisb.) Engelm. | | | Yucca recurvifoliaSalisb. | Yucca gloriosaL. var.recurvifolia (Salisb.) Engelm. |
| Yucca neomexicana Wooton & Standl. | | a | | Yucca neomexicanaWooton & Standl. | |
| Yucca harrimaniae Trel. var. neomexicana (Wooton & Standl.) Reveal | Yucca neomexicana Wooton & Standl. | | i | Yucca harrimaniaeTrel. var.neomexicana (Wooton & Standl.) Reveal | Yucca neomexicanaWooton & Standl. |
| Yucca harrimaniae Trel. subsp. neomexicana (Wooton & Standl.) Hochstätter | Yucca neomexicana Wooton & Standl. | | i | Yucca harrimaniaeTrel. subsp. neomexicana (Wooton & Standl.) Hochstätter | Yucca neomexicanaWooton & Standl. |
| Yucca madrensis Gentry | | a | | Yucca madrensisGentry | |
| Yucca funifera K. Koch | Hesperaloe funifera (K. Koch) Trel. | | | Yucca funiferaK. Koch | Hesperaloe funifera(K. Koch) Trel. |
| Yucca treculeana Carrière | | a | | Yucca treculeanaCarrière | |
| Yucca reverchonii Trel. | | a | | Yucca reverchoniiTrel. | |
| Yucca arkansana Trel. | | a | | Yucca arkansanaTrel. | |
| Yucca arkansana Trel. subsp. arkansana | | a | i | Yucca arkansanaTrel. subsp. arkansana | |
| Yucca arkansana Trel. subsp. louisianensis (Trel.) Hochstätter | | a | i | Yucca arkansanaTrel. subsp. louisianensis (Trel.) Hochstätter | |
| Yucca louisianensis Trel. | Yucca arkansana Trel. subsp. louisianensis (Trel.) Hochstätter | | | Yucca louisianensisTrel. | Yucca arkansanaTrel. subsp. louisianensis (Trel.) Hochstätter |
| Yucca baileyi Wooton & Standl. var. navajoa (J. M. Webber) J. M. Webber | Yucca baileyi Wooton & Standl. | | i | Yucca baileyiWooton & Standl. var.navajoa (J. M. Webber) J. M. Webber | Yucca baileyiWooton & Standl. |
| Yucca thompsoniana Trel. | | a | | Yucca thompsonianaTrel. | |
| Yucca faxoniana Sarg. | | a | | Yucca faxonianaSarg. | |
| Yucca cernua E. L. Keith | | a | | Yucca cernuaE. L. Keith | |
| Yucca aletriformis Haw. | Dracaena aletriformis (Haw.) Bos | | | Yucca aletriformisHaw. | Dracaena aletriformis(Haw.) Bos |
| Yucca campestris McKelvey | | a | | Yucca campestrisMcKelvey | |
| Yucca pallida McKelvey | | a | | Yucca pallidaMcKelvey | |
| Yucca rostrata Engelm. ex Trel. | | a | | Yucca rostrataEngelm. ex Trel. | |
| Yucca angustissima Engelm. ex Trel. subsp. angustissima | Yucca angustissima Engelm. ex Trel. var. angustissima | | i | Yucca angustissimaEngelm. ex Trel. subsp. angustissima | Yucca angustissimaEngelm. ex Trel. var.angustissima |
| Yucca brevifolia Engelm. var. brevifolia | Yucca brevifolia Engelm. | | i | Yucca brevifoliaEngelm. var.brevifolia | Yucca brevifoliaEngelm. |
| Yucca brevifolia Engelm. subsp. brevifolia | Yucca brevifolia Engelm. | | i | Yucca brevifoliaEngelm. subsp. brevifolia | Yucca brevifoliaEngelm. |
| Yucca baccata Torr. f. baccata | Yucca baccata Torr. var. baccata | | i | Yucca baccataTorr. f. baccata | Yucca baccataTorr. var.baccata |
| Yucca angustifolia Pursh var. angustifolia | Yucca glauca Nutt. | | i | Yucca angustifoliaPursh var.angustifolia | Yucca glaucaNutt. |
| Yucca baileyi Wooton & Standl. var. baileyi | Yucca baileyi Wooton & Standl. | | i | Yucca baileyiWooton & Standl. var.baileyi | Yucca baileyiWooton & Standl. |
| Yucca elata Engelm. subsp. elata | Yucca elata Engelm. var. elata | | i | Yucca elataEngelm. subsp. elata | Yucca elataEngelm. var.elata |
| Yucca harrimaniae Trel. var. harrimaniae | Yucca harrimaniae Trel. | | i | Yucca harrimaniaeTrel. var.harrimaniae | Yucca harrimaniaeTrel. |
| Yucca harrimaniae Trel. subsp. harrimaniae | Yucca harrimaniae Trel. | | i | Yucca harrimaniaeTrel. subsp. harrimaniae | Yucca harrimaniaeTrel. |
| Yucca whipplei Torr. subsp. whipplei | Hesperoyucca whipplei (Torr.) Trel. | | i | Yucca whippleiTorr. subsp. whipplei | Hesperoyucca whipplei(Torr.) Trel. |