Faculty Profiles

Bellis, J., Albrecht, M., Maschinski, J., Dalrymple, S., Keir, M., Chambers, T., … Heineman, K. (2025). The relative influence of geographic and environmental factors on rare plant translocation outcomes. Journal of Applied Ecology.

McClendon, A., (Waliczek) Cade, T. M., Serenari, C., & Williamson, P. S. (2024). Effects of an informal educational program on knowledge and perceptions of invasive species management. HortTechnology, 34(1), 71–79. https://doi.org/DOI:10.21273/horttech05276-23

Bellis, J., Osazuwa-Peters, O., Maschinski, J., Keir, M., Parsons, E. W., Kaye, T. N., … Albrecht, M. A. (2023). Identifying predictors of reintroduction success in rare plant species. Conservation Biology, 38(2). https://doi.org/https://doi.org/10.1111/cobi.14190

Williamson, P. S., Berresford, P., Fehlberg, S. D., Terry, M., Strong, A. W., McKinney, J., & Emakova, A. O. (2023). Vorkommen und Phylogenie des bedrohten in Texas endemischen Echinocereus fitchii subsp. albertii. Der Echinocereenfreund, 36(2), 38:69.

Williamson, P. S., Berresford, P., Fehlberg, S. D., M. Terry, Strong, A. W., McKinney, J., & Ermakova, A. O. (2022). Occurrence and phylogeny of the endangered Texas endemic Echinocereus fitchii subsp. albertii. Bradleya, 40, 27–48.

Berresford, P., Williamson, P. S., McKinney, J., Best, C., & Terry, M. (2022). Case studies of building collaborative partnerships for conservation of endangered and threatened cacti in Texas. Bradleya, Special, 17–32.

Crawford, M. A., Williamson, P. S., Cade, T. M., Lemke, D. E., & Hardy, T. (2020). Effects of photosynthetically active radiation on vegetative growth of Texas wild rice and consequences for population augmentation. HortScience, 55(7), 1000–1004.

Waliczek, T. M., Parsley, K., Williamson, P. S., & Oxley, F. (2018). Curricula Influence College Student Knowledge and Attitudes Regarding Invasive Species. HortTechnology, 28, 548–556.

Parsley, K., Williamson, P. S., (Waliczek) Cade, T. M., & Oxley, F. (2018). Lecture and laboratory curricula influence college student knowledge and attitudes regarding invasive species. HortScience.

Waliczek, T. M., Williamson, P. S., & Oxley, F. M. (2017). College student knowledge and perceptions of invasive species. HortTechnology, 27(4), 550–556.

Parsley, K. M., Waliczek, T. M., Williamson, P. S., & Oxley, F. (2017). Measuring the effectiveness of invasive species education curricula on student knowledge of invasive species. Texas Academy of Science at the University of Mary-Hardin Baylor.

Oxley, F. M., Waliczek, T. M., & Williamson, P. S. (2016). Stakeholder opinions on invasive species and their management in the San Marcos River. HortTechnology, 26, 514–521.

Oxley, F., Waliczek, T. M., & Williamson, P. (2016). Public Opinions of Invasive Species and their Management in the San Marcos River. HortTechnology, 26, 514–521.

Parsley, K. M., Waliczek, T. M., Williamson, P. S., & Oxley, F. (2016). Bringing invasive species into the college classroom. Texas State University, San Marcos, TX.

Parsely, K. M., Waliczek, T. M., Williamson, P. S., & Oxley, F. (2016). Bringing invasive species into the college classroom. National Association of Biology Teachers.

Hardy, T., Crawford, M., Agare, O., Williamson, P. S., & Nowlin, W. H. (2016). Suspended sediment impacts on Texas wild-rice and other aquatic plant growth characteristics and aquatic macroinvertebrates.

Ferrazzano, S., & Williamson, P. S. (2013). Benefits of mycorrhizal inoculation in reintroduction of  endangered plant species under drought conditions. Journal of Arid Environments, 98, 123–125.

Ferguson, A. W., Strauss, R. E., Strong, A. W., Birnbaum, S. J., Poole, J. M., Janssen, G. K., & Williamson, P. S. (2013). Assessing regional differences in predation of endangered species:  Implications from Texas populations of the endangered star cactus (Astrophytum asterias). Journal of Arid Environments, 97, 143–149.

Echo-Hawk, P. D., Oxley, F. M., Williamson, P. S., Cantu, V., & Ostrand, K. (2013). Integrated management of an invasive macrophyte. Journal of Aquatic Plant Management, 52, 97–101.

Goodson, J. J., & Williamson, P. S. (2011). Germination of seeds in the endangered Abronia macrocarpa. Southwestern Naturalist, 56, 141–146.

Birnbaum, S. J., Poole, J. M., & Williamson, P. S. (2011). Reintroduction of star cactus Astrophytum asterias by seed sowing and seedling transplanting. Conservation Evidence, 4, 43–52.

Blair, A. W., & Williamson, P. S. (2010). Pollen dispersal in star cactus (Astrophytum asterias). Journal of Arid Environments, 74, 525–527.

Ferguson, A. W., & Williamson, P. S. (2009). New Host Plant Record, the Endangered Star Cactus (Astrophytum asterias), for Moneilema armatum LeConte (Coleoptera: Cerambycidae: Lamiinae). The Coleopterists Bulletin, 63, 218–220.

Watson, C. A., Weckerly, F. W., Hatfield, J. S., Farquhar, C., & Williamson, P. S. (2008). Detection, occupancy and survey effort of Golden-cheeked warblers (Dendroica chrysoparia). Animal Conservation, 11, 484–492.

Blair, A., & Williamson, P. S. (2008). Effectiveness and importance of pollinators in star cactus (Astrophytum asterias). Southwestern Naturalist, 53, 423–430.

Atkins, E. O., & Williamson, P. S. (2008). Comparison of four techniques to eradicate elephant ear. Journal of Aquatic Plant Management, 46, 158–162.

Strong, A. W., & Williamson, P. S. (2007). Breeding system of Astrophytum asterias. Southwestern Naturalist, 52, 341–346.

Williamson, P. S. (2004). Status of the Large-fruited sand verbena (Abronia macrocarpa). Lady Bird Johnson Wildflower Center Publication.

Schneider, E. L., Tucker, S. C., & Williamson, P. S. (2003). Floral development in the Nymphaeales. International Journal of Plant Science, 164, 5279–5292.

Lippok, B., Gardine, A. A., Williamson, P. S., & Renner, S. S. (2000). Pollination by flies, bees, and beetles of Nuphar ozarkana and N. advena (Nymphaeaceae). American Journal of Botany, 87, 898–902.

Arsuffi, T. L., Williamson, P. S., de la Garza Newkirk, M., & Howard, M. (2000). The San  Marcos River Wetlands Project: Restoration and environmental education in Texas. International Journal of Wilderness, 6, 17–21.

Williamson, P. S., & Werth, C. R. (1999). Levels and patterns of genetic variation in the endangered species Abronia macrocarpa (Nyctaginaceae). American Journal of Botany, 86, 293–301.

Arsuffi, T. L., Williamson, P. S., & de la Garza Newkirk, M. (1999). The San Marcos River  Wetlands Project: Restoration and a vision of environmental stewardship and management for urban rivers in Texas through education and partnerships (pp. 161–170).

Howard, M. S., Arsuffi, T. L., Williamson, P. S., Rose, F. R., & de ka Garza Newkirk, M. (1998). The San Marcos River Habitat Conservation Plan: A solution to pollution. Symposium Proceedings.

Williamson, P. S., & Bazeer, S. K. (1997). Self-incompatibility in Abronia macrocarpa. Southwestern Naturalist, 42, 409–415.

Van Auken, O. W., & Williamson, P. S. (1997). Rare plants of the southwest: forward. Southwestern Naturalist, 42, 367–368.

M, E. A., & Williamson, P. S. (1996). Laboratory Manual to Accompany The Botanical World. Iowa, USA: Wm. C. Brown Publishers.

M., E. A., & Williamson, P. S. (1996). Instructor’s Resource Guide for the Laboratory Manual to Accompany The Botanical World. Iowa: Wm. C. Brown Publishers.

Schneider, E. L., & Williamson, P. S. (1996). Barclaya rotundifolia. Aqua-Planta, 2, 87–95.

Janssen, G. K., & Williamson, P. S. (1996). Encouraging conservation of endangered plants on private lands: A case study of Frankenia johnstonii, an endangered south Texas subshrub. In USDA Forest Service General Technical Report RM-GTR-283 (pp. 1–7).

Williamson, P. S., & Schneider, E. L. (1994). Floral aspects of Barclaya (Nymphaeaceae): Pollination, ontogeny and structure. Plant Systematics and Evolution, 8, 104–115.

Williamson, P. S., & Schneider, E. L. (1994). Ondinea purpurea den Hartog. Aqua-Planta, 1, 3–10.

Williamson, P. S., Muliani, L., & Janssen, G. K. (1994). Pollination biology of Abronia macrocarpa (Nyctaginaceae), an endangered Texas species. Southwestern Naturalist, 39, 336–341.

Williamson, P. S., & Schneider, E. L. (1993). Cabombaceae. In K. Kubitzki (Ed.), The Families and Genera of Flowering Plants (Vol. II). New York: Springer-Verlag.

Williamson, P. S., & Schneider, E. L. (1993). Nelumbonaceae. In K. Kubitzki (Ed.), The Families and Genera of Flowering Plants (Vol. II). New York, USA: Springer-Verlag.

Schneider, E. L., & Williamson, P. S. (1993). Nymphaeaceae. In K. Kubitzki (Ed.), The Families and Genera of Flowering Plants (Vol. II). New York, USA: Springer-Verlag.

Moseley, M. F., Schneider, E. L., & Williamson, P. S. (1993). Phylogenetic interpretations from selected floral vasculature characters in the Nymphaeaceae, sensu lato. Aquatic Botany, 44, 325–342.

Williamson, P. S. (1991). Ondinea, the new Australian water lily. Water Garden Journal, 7, 43–48.

Williamson, P. S. (1991). Ecological anatomy of Nuphar luteum leaves. Texas A&M University EM Views, 6, 7–8.

Williamson, P. S. (1991). Crisis in Science: Creating an interest in botany (pp. 91–105).

Skubatz, H., Williamson, P. S., Schneider, E. L., & Meeuse, B. J. D. (1990). Cyanide-insensitive respiration in thermogenic flowers of Victoria and Nelumbo. Journal of Experimental Botany, 41, 1335–1339.

Schneider, E. L., Williamson, P. S., & Whitenberg, D. C. (1990). Hot sex in water lilies. Water Garden Journal, 6, 41–51.

Williamson, P. S. (1990). Structural adaptations of aquatic macrophytes. Teaching the Limnology Laboratory Symposium Proceedings.

Williamson, P. S., Schneider, E. L., & Malins, L. A. (1989). Tuber and leaf structure of Ondinea purpurea den Hartog (Nymphaeaceae). Western Australian Naturalist, 18, 52–61.

Williamson, P. S., & Moseley, M. F. (1989). Morphological studies of the Nymphaeaceae (s.l.).  XVII. The floral anatomy of Ondinea purpurea subspecies purpurea. American Journal of Botany, 76, 1781–1796.

Moseley, M. F., Mehta, L. J., Williamson, P. S., & Kosakai, H. (1984). Morphological studies of the Nymphaeaceae (s.l.).  XIII.  Contributions to the vegetative and floral structure of Cabomba. American Journal of Botany, 71, 902–924.

Schneider, E. L., Moseley, M. F., & Williamson, P. S. (1983). The pollination biology of Ondinea  purpurea. Proceedings of the Vth International Symposium on Pollination. Ed. INRA Publ. Les Colloques de I’INRA, n-21, 231–235.