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- Butterworth, C. A. & J. H. Cota-Sanchez, & R. S. Wallace. 2002. Molecular systematics of Tribe Cacteae (Cactaceae: Cactoideae): A phylogeny based on rpl16 intron sequence variation. Systematic Botany 27(2): 257-270.
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- Butterworth, C. A. & R. S. Wallace. 2004. Phylogenetic studies of Mammillaria (Cactaceae) – insights from chloroplast sequence variation and hypothesis testing using the parametric bootstrap. American Journal of Botany 91(7): 1086-1098.
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