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We used existing information to convey the general boundary and geographical limits of where Joshua trees occur on the landscape, as represented by polygons. The existing information comes from a number of sources, but primarily from Rowlands (1978, entire), Cole <\/SPAN><\/SPAN>et al. <\/SPAN><\/SPAN>(2003, entire and 2011, entire) and Godsoe <\/SPAN><\/SPAN>et al. <\/SPAN><\/SPAN>(2009, entire). The polygon maps were verified using Godsoe <\/SPAN><\/SPAN>et al<\/SPAN><\/SPAN>. (2009, p. 592) who mapped 5,767 presence points across the Joshua tree range. Cole\u2019s 2003 distribution mapping was updated in 2011 using presence points recorded in plots contained within the LANDFIRE Reference Database (2007, entire), the Central Mojave field data (Thomas <\/SPAN><\/SPAN>et al. <\/SPAN><\/SPAN>2002, entire), and the Beatley Plots (Webb <\/SPAN><\/SPAN>et al. <\/SPAN><\/SPAN>2003, entire). The Service\u2019s distribution map also incorporates a number of additional datasets (e.g., SEINet, Consortium of California Herbaria) that were combined to create the most likely distribution, or range boundary. 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