For Yucca
Clary, K.H., and T.P. Adams. 2021. Yucca carrii (Asparagaceae), a new species from the northern Gulf Coast prairie of Texas. Lundellia 24: 11-23.
Hess, W.J., and R.L. Robbins. 2002. Yucca. In Flora of North America Editorial Committee. 2002a. Flora of North America north of Mexico. Volume 26, Magnoliophyta: Liliidae: Liliales and Orchidales. Oxford Univ. Press, New York, NY. 723 pp.
Keith, E.L. 2003. Yucca cernua (Agavaceae), a new species of Yucca from the series Rupicolae in Newton and Jasper counties in eastern Texas. Sida 21: 891-898.
Speta. 1998. In Kubitzki, K., ed. 1998a. The families and genera of vascular plants. III. Flowering plants – Monocotyledons – Lilianae (except Orchidaceae). Springer, Berlin. 478 pp.
Ward, D.B. 2004c. New combinations in the Florida flora II. Novon 14: 365-371.
Ward, D.B. 2006a. A nomenclatural history of southeastern filiferous Yucca, with selection of a neotype for Y. flaccida. Castanea 71: 80-84.
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