Table 1. Summary of Cirsium hillii occurrences by state and province, with a breakdown by last observation date. (#=footnotes)



  State or   Element Rank    Number of        Last      Last Observed      Last      Last Observed     Unknown     

Province       (#3)       Occurrences     Observed      1950-1971      Observed       pre-1900     Observation   

                              Recorded      1972-1997                    1900-1949                       Date      



Illinois          S1             39            38             1                                                    



Indiana           S1             16             5             0              9                            2        



Iowa              S1             5              5             *              *             *                       



Michigan          S3            130            102            14             9             5                       



Minnesota         S3             58            37             2              9             8              2        



Ohio           SRF (#4)          0              -             -              -             -              -        



Wisconsin         S2             68            34             11            19             3              1        



Ontario           S2            ~40           (#5)            -              -             -              -        



Totals:          -            356            221            28            46             16             5        






TABLE FOOTNOTES:

* Historical occurrences documented through several collection records include this category but were not provided in the state status report and thus cannot be detailed here. The number of occurrences recorded for Iowa only reference confirmed extant populations .

3 The sub-global rank for Hill's thistle within the states and province in its range.

4 Reported falsely within the state.

5 Because the number of Ontario sites are estimated from numerous collection records, a breakdown by collection period cannot be provided.

TEXT FOOTNOTES:

1) Heritage programs track must track species (i.e. "elements") on an arbitrarily determined locality basis for their databases. Thus, an occurrence may not necessarily constitute what one might consider a population, and in many cases may represent a series of colonies or patches that can be collectively be described as metapopulations.

2) Appendix A provides an explanation of Nature Conservancy element occurrence ranks.