McIntosh, M.E. 2005. Pollination of two species of Ferocactus: interactions between cactus-specialist bees and their host plants. Functional Ecology 19 (4): 727-734. pdf file (189 kb)
McIntosh, M.E. 2002. Plant size, breeding system, and limits to reproductive success in two sister species of Ferocactus (Cactaceae). Plant Ecology 162: 273-288. pdf file (1.8 MB)
McIntosh, M.E. 2002. Flowering phenology and reproductive output in two sister species of Ferocactus (Cactaceae). Plant Ecology 159: 1-13. pdf file (219 kb)
McIntosh, M.E. 1996. Nest-substrate preferences of Pemphredon lethifer (Hymenoptera: Sphecidae), Ceratina nanula and Ceratina acantha (Hymenoptera: Apidae). Journal of the Kansas Entomological Society 69(4) suppl.: 216-231.