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.7 <br />C, <br />• <br />Figure 3. Known distribution of Spiranthes diluvialis in western North America circa <br />January 1992. Populations that were extant at this time are depicted as black circles, <br />while populations that were considered extirpated are marked with an "x ". Locations <br />are derived from natural heritage program data and based on standardized element <br />occurrence criteria of NatureServe (2004) (seepage 33 for discussion). <br />