Spencer, S. C., and A. E. Spencer. 2003. Navarretia willamettensis and Navarretia saximontana (Polemoniaceae), new species from ephemeral wetlands of western North America. Madrono 50:196-199.

Spencer, S. C., and L. H. Rieseberg. 1998. Evolution of amphibious vernal pool specialist annuals: putative vernal pool adaptive traits in Navarretia (Polemoniaceae). In C.W. Witham, D. Belk, W. Ferren, and R. Ornduff (eds.) Ecology, conservation, and management of vernal pool ecosystems — proceedings from a 1996 conference. California Native Plant Society, Sacramento, California.

Spencer, S. C., and J. M. Porter. 1997. Evolutionary diversification and adaptation to novel environments in Navarretia (Polemoniaceae). Systematic Botany 22:649-668.

Wolf, D. E., L. H. Rieseberg, and S. C. Spencer. 1997. The genetic mechanism of sex determination in the androdioecious flowering plant, Datisca glomerata (Datiscaceae). Heredity 78:190-204.

Spencer, S. C. 1997. The evolution of vernal pool specialists in Navarretia (Polemoniaceae). Ph.D. Dissertation. Claremont Graduate School, Claremont, California. [ABSTRACT]

Spencer, S. C., and L. H. Rieseberg. 1995. The importance of flowering time and flower number in the relative fitness of males and hermaphrodites in Datisca glomerata (Datiscaceae). Plant Species Biology 10: 65-69.

Rieseberg, L. H., G. J. Allan, Y. Bui, J. Greene, P. L. Morrell, S. C. Spencer, and B. O’Brien. 1994. Genetic fingerprinting of various native California cultivars. Madrono 41:30-38.

Carlson, C. E., R. G. Cates, and S. C. Spencer. 1991. Foliar terpenes of a putative hybrid swarm (Larix occidentalis Nutt. X L. lyallii Par.) in western Montana. Canadian Journal of Forest Research 21:876-881.