Syn.: Cleistoyucca arborescens (Torr.) Eastw., Clistoyucca arborescens (Torr.) Trel., Clistoyucca brevifolia (Engelm.) Rydb., Sarcoyucca brevifolia (Engelm.) Linding., Yucca arborescens (Torr.) Trel., Yucca draconis var. arborescens Torr., Yucca jaegeriana (McKelvey) L. W. Lenz
Family: Asparagaceae Juss.

Syn.: Yucca angustifolia Pursh, Yucca flaccida var. integra Trel., Yucca stricta Sims
Family: Asparagaceae Juss.

Syn.: Anticlea alpina A. Heller, Anticlea chlorantha (Richardson) Rydberg, Anticlea coloradensis (Rydberg) Rydberg, Anticlea elegans (Pursh) Rydberg, Anticlea glauca (Nuttall) Kunth, Anticlea gracilenta (Greene) R. R. Gates, Anticlea longa (Greene) A. Heller, Anticlea mohinorensis (Greenman) R. R. Gates, Melanthium glaucum Nuttall, Zigadenus alpinus Blankinship, Zigadenus chloranthus Richardson, Zigadenus coloradensis Rydberg, Zigadenus dilatatus Greene, Zigadenus elegans subsp. glaucus (Nuttall) Hultén, Zigadenus elegans var. glaucus (Nuttall) Preece ex Cronquist, Zigadenus glaucus (Nuttall) Nuttall, Zigadenus gracilentus Greene, Zigadenus longus Greene, Zigadenus mohinorensis Greenman, Zigadenus washakie A. Nelson
Family: Melanthiaceae Batsch

Syn.: Toxicoscordion venenosum (S. Watson) Rydb.
Family: Melanthiaceae Batsch

Syn.: Thaspium trifoliatum var. apterum A. Gray, Zizia cordata W. D. J. Koch ex DC.
Family: Apiaceae Lindl.

Syn.: Tetraena fontanesii (Webb et Berthel.) Beier et Thulin
Family: Zygophyllaceae R. Br.