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• <br />• <br />U <br />Figure 4. Known distribution of Spiranthes diluvialis in western North America circa <br />July 2005. Extant populations are indicated by black circles, while extirpated <br />populations are marked by an "x ". Locations are derived from natural heritage program <br />data and based on standardized element occurrence criteria ofNatureServe (2004) (see <br />page 33 for discussion). <br />10 <br />