We have employed herbarium specimens, historical records and molecular techniques in reconstructing the introduction and spread of Bromus tectorum L. (or Anisantha tectorum [L.] Nevski [Stace 1997]) (Figure 1) into North America and other portions of the grass's naturalized ranges (Novak et al. 1991, Novak and Mack 1993, Novak et al. 1993). We summarize in this article a portion of our findings from this ongoing effort. Published in Bioscience, volume 51, issue 2, on pages 114 - 122, in 2001.