Poster # 25. Salo, Lucinda^*,1,2, McPherson, Guy¹, Williams, David¹, ¹ Renewable Natural Resources, Tucson, AZ² Institut des Sciences de l'Environnement, Dakar, Senegal Sonoran Desert winter annuals affected by density of red brome and soil nitrogen level.

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Poster # 26. DeFalco, Lesley^*,1,2, Nowak, Robert², ¹ US Geological Survey, Las Vegas, NV² Program in Ecology, Evolution and Conservation Biology, Reno, NV Seasonality of simulated rainfall influences the interaction between the invasive annual grass Bromus madritensis ssp. rubens and Mojave Desert perennials.

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Poster # 27. Ramakrishnan, Alisa^*,1,2, Meyer, Susan², Coleman, Craig¹, Fairbanks, Daniel¹, ¹ Brigham Young University, Provo, UT² USDA Forest Service Shrub Sciences Laboratory, Provo, UT Population genetics of cheatgrass in select areas of the Great Basin.

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Poster # 28. Ashley, Michael^*,1, Longland, William^*,1,2, ¹ United States Department of Agriculture, Reno, NV² University of Nevada, Reno, Reno, NV A RAPD assessment of outcrossing and invasion in cheatgrass (Bromus tectorum).

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Poster # 29. Mau-Crimmins, Theresa^*,1, Geiger, Erika¹, Schussman, Heather¹, ¹ University of Arizona, Tucson, AZ Razing Arizona: modeling the extent and spread of a wonder grass in the American Southwest.

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Poster # 30. Lepak, Dominika^*,1, Abbott, Laurie¹, ¹ New Mexico State University, Las Cruces, NM Influence of moisture and temperature on African rue (Peganum harmala) germination.

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Poster # 31. SCHUSSMAN, HEATHER^*,1, ¹ University of Arizona, Tucson, AZ Analysis of genetic variation in the introduced grass Eragrostis lehmanniana Ness. on the Santa Rita Experimental Range (SRER) in southeastern Arizona.

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Poster # 32. Crealock, Anne^*,1, O'Malley, Rachel¹, ¹ San Jose State University, San Jose, CA Hiking versus multi-use trails as corridors for exotic plant invasion.

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Poster # 33. Emery, Sarah^*,1, Gross, Katherine¹, Suding, Katharine^1,2, ¹ W.K. Kellogg Biological Station, Hickory Corners, MI² University of Colorado, Boulder, CO Responses of Centaurea maculosa populations to seasonal variation in prescribed burns in a Midwest prairie restoration.

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