Messinger Carril, O.J., L.S. McElfresh, J.G. Millar, and S.D. Sipes.  Scents and scent-ability: The role of olfaction in host selection for an oligolectic bee genus, Diadasia. In prep.

Soley, N. and S. Sipes. Pollination ecology of an invasive shrub, Elaeagnus umbellata. In prep.

Chupp, A.D., L.L. Battaglia, E.M. Schauber, and S.D. Sipes. 2015. Orchid–pollinator interactions and potential vulnerability to biological invasion. AoB Plants 7: plv099 doi:10.1093/aobpla/plv099.

Wilson, J., O. Messinger Carril, and S. Sipes. 2014. Revisiting the Great American Biotic Interchange through analyses of amphitropical bees. Ecography 37: 791-796. doi 10.1111/ecog.00663.

Sipes, S.D., K.E. Huff Hartz, H. Amin, and D.L. Nickrent. 2014. Floral scent and pollinators of the holoparasite Pilostyles thurberi (Apodanthaceae). Journal of Pollination Ecology 12: 31-39.

Sipes, S.D. and V.J. Tepedino. 2006. Perfection subverted: contrivances for outcrossing in a rare orchid are influenced by pollinator abundance. Journal of the Torrey Botanical Society 133: 412-420.

Cane, J.H. and S.D. Sipes. 2006. Characterizing Floral Specialization by Bees: Analytical Methods and a Revised Lexicon for Oligolecty. Pp. 99-122 in N. M. Waser and J. Ollerton (eds). Generalization and Specialization in Plant-Pollinator Interactions. U. Chicago Press.

Danforth, B., S. Sipes, J. Fang, and S.G. Brady. 2006. The history of early bee diversification based on five genes plus morphology. Proceedings of the National Academy of Sciences 103: 15118-15123.

Saunders, N.E. and S.D. Sipes. 2006. Reproductive biology and pollination ecology of the rare Yellowstone Park endemic Abronia ammophila. Plant Species Biology 21: 75-84.

Danforth, B.N., J. Fang, and S. Sipes. 2006. Analysis of family-level relationships in bees (Hymenoptera: Apiformes) using 28S and two previously unexplored nuclear genes: CAD and RNA polymerase II. Molecular Phylogenetics and Evolution 39: 358-372.

Minnis, A.M., W.J. Sundberg, A.S. Methven, S.D. Sipes, and D.L. Nickrent. 2006. Annulate Pluteus species: a study of the genus Chamaeota in the United States. Mycotaxon 96: 31-40.

Brady, S.G., S. Sipes, A. Pearson, and B.N. Danforth. 2006. Recent and simultaneous origins of eusociality in halictid bees. Proceedings of the Royal Society B 273: 1643-1649. doi 10.1098/rsbp.2006.3496.

Sipes, S.D. and V.J. Tepedino. 2005. Levels of pollen host specialization, and evolutionary patterns of host-switching in a clade of specialist bees. Biological Journal of the Linnean Society 86: 487-505.

Danforth, B.N., S. Brady, S. Sipes, and A. Pearson. 2004. Single copy nuclear genes recover Cretaceous-aged divergences in bees. Systematic Biology 53: 309-326.

Tepedino, V.J., S.D. Sipes, and T.L. Griswold. 2004. Reproduction and demography of Townsendia aprica (Asteraceae), a rare endemic of the southern Utah plateau. Western North American Naturalist 64: 465-470.

Sipes, S.D. and P.G. Wolf. 2001. Phylogenetic relationships within Diadasia, a group of specialist bees. Molecular Phylogenetics and Evolution 19: 144-156.

Wolf, P.G., D.R. Campbell, N.M. Waser, S.D. Sipes, T.R. Toler, and J.K. Archibald. 2001. Examination of reproductive barriers between sympatric Ipomopsis aggregata and I. arizonica (Polemoniaceae). American Journal of Botany 88: 213-219.

Pryer, K.M., H. Schneider, A.R. Smith, R.B. Cranfill, P.G. Wolf, J.S. Hunt, and S.D. Sipes. 2001. Horsetails and ferns are monophyletic and the closest living relatives to seed plants. Nature 409: 618-622 (1 February 2001).

Tepedino, V.J. and S.D. Sipes. 2000. Can a transplanted pollinator increase reproductive success in populations of the threatened orchid, Spiranthes diluvialis? Ecological Restoration 18: 132-133.

Sipes, S.D. 1999. The female of Diadasia afflictula unveiled and verified using molecular markers (Hymenoptera: Apoidea). In Byers, G.W., R.H. Hagen, and R.W. Brooks (eds.), Entomological contributions in memory of Byron A. Alexander. University of Kansas Natural History Museum Special Publication 24. pp 51-57.

V.J. Tepedino, S.D. Sipes, and T.G. Griswold. 1999. The reproductive biology and effective pollinators of the endangered beardtongue Penstemon penlandii (Scrophulariaceae). Plant Systematics and Evolution 219: 39-54.

Wolf, P.G., S.D. Sipes, M.R. White, M.L. Martines, K.M. Pryer, A.R. Smith, and K. Ueda. 1999. Phylogenetic relationships of the enigmatic fern families Hymenophyllopsidaceae and Lophosoriaceae: evidence from rbcL nucleotide sequences. Plant Systematics and Evolution 219: 263-270.

Sipes, S.D. and P.G. Wolf. 1997. Clonal structure and patterns of allozyme diversity in the rare endemic Cycladenia humilis var. jonesii (Apocynaceae). American Journal of Botany 84: 401-409.

Wolf, P.G., R.A. Murray, and S.D. Sipes. 1997. Species-independent, geographic structuring of chloroplast DNA haplotypes in a montane herb, Ipomopsis (Polemoniaceae). Molecular Ecology 6: 283-291.

Tepedino, V.J., S.D. Sipes, J.L. Barnes, and L.L. Hickerson. 1997. The need for “extended care” in conservation: examples from studies of rare plants in the western United States. Acta Horticulturae 437: 245-248.

Sipes, S.D. and V.J. Tepedino. 1994. Reproduction of the rare orchid, Spiranthes diluvialis: breeding system, pollination, and implications for conservation. Conservation Biology 9: 929-938.