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Table 1 B. CeFnirion of Natural Herica;e State Rarity Ranks <br />These ranks should not be interpreted as legal desi;nadons. <br />State rank (S): Based on the status of a species in an individual sore. 5 ranks may differ among states based <br />on the relative abundance of a species in each state. Species or plan[ communities that rank 51 to 53 are <br />considered imperiled or vulnerable and the status and Iocavcns of each are cicsely monitored. Species or <br />plant communities [ha[ are ranked 54 or 55 are no[ actively monitored, except that the Iocaticrs of the best <br />examples of all plan[ communities are monitored. The sous of all e!emena is reviewed annually. <br />S1 Critically imperiled in state because of extreme rarity (S or fewer occurrences, or <br />very few remaining individuals), or because of some factor of its biology making it especially <br />vulnerable to extirpation from the state. <br />S2 Imperiled in state because of rariy (6 to 20 occur, ences), or because of ocher <br />factors demonsvably making it very vulnerable to extin, ation from the state. <br />S3 Vulnerable in sore (2i to i00 occurrences). <br />5354 Watchlisted. Specific occurrence data are collected and periodically <br />analyzed co determine whedter more active tracking is warranted. Watchlisted species are <br />indicated in this document with ""'. <br />S4 Apparently secure in the state. On{y high quality examples of native plant <br />communities of this ranking are actively tracked. <br />S5 Demcnstrably secure in the state. Only high quality examples of native plan[ <br />communities of this ranking are actively [racked. <br />SIB Refers to the breeding season imperilment of elements that are not permanent <br />residents. <br />SAN Refers co the non-breeding season imperilment of elements that are not permanent <br />residents. Where no consistent location can be discerned for migrants or non-breeding <br />populations, a rank o(SZN is used. <br />SZ Migrant whose occurrences are too irregular, transitory, and/or dispersed to be <br />reliably identified, mapped, and protected. <br />SH Historically known from the state, but not verified for an ex[ended period, usually <br />> 15 years; this rank is used primarily when inven[ory has been attempted recently. <br />SX Presumed extirpated from the sore. <br />_. S~? Indicates uncertainty about an assigned sore rank. <br />SU :. .Unable eo assiprs rarity rank, often because of low search effort or cryptic nature of <br />the element. <br />SA Accidenol in the state. <br />SR Reposed co occur in the sore, but unverified. <br />S? Unranked. Some evidence that species may be imperiled, but awaiting formal rarity <br />ranking. <br />