For Hypoxis
Herndon, A. 2002. Hypoxis. 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.
Judd, W.S. 2000. The Hypoxidaceae in the southeastern United States. Harvard Papers in Botany 5: 79-98.
Nordal. 1998. In Kubitzki, K., ed. 1998a. The families and genera of vascular plants. III. Flowering plants – Monocotyledons – Lilianae (except Orchidaceae). Springer, Berlin. 478 pp.
Zona, S., J. Prince, G. Halder, R. Schwartz, and R. Vargas. 2009. A seed atlas of Hypoxis from eastern North America. J. Torrey Bot. Soc. 136: 26-32.
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