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April 23, 2015 – Changes to Plant S-ranks

The Botanical Assessment Working Group (BAWG) recently reassessed the ranks of six species: Achnatherum nelsonii ssp. dorei, Polygala senega, Osmorhiza depauperata, Antennaria howellii ssp. canadensis, Antennaria howellii ssp. neodioica, and Myriophyllum verticillatum. A summary of the changes made to these species can be found in the table below.

In addition, Amelanchier sanguinea has been added to Saskatchewan’s flora list as an S1. Thus far it is known only from the Moose Mountain area. See the following for a key to the Amelanchier species found in Saskatchewan (this article can be found online):

Catling PM and G Mitrow. 2006. Regional variation in Amelanchier in the Whitewood area of southeastern Saskatchewan and the first Saskatchewan records of Amelanchier sanguinea. Canadian Field-Naturalist 120(4): 428–432.

Sisyrinchium mucronatum and S. septentrionale are awaiting reassessment pending additional information. Both species continue to be tracked at this time.

Please note that every effort has been made to ensure that this list is accurate; however, the lists provided on our lists page are the final authority for this type of information. For the convenience of our users, we have added the rank reassessment and rank change dates into the excel files of our species lists. This will allow users to sort the data and view the most recently assessed taxa.

For more information on the ranking process, please see our ranking page. If you have a plant taxon that you believe should be a priority for a rank reassessment, please contact the SKCDC botanist.

Taxa with S-ranks Recently Reassessed or Tracking Statuses Changed

Scientific Name Common Name New (or current) S-rank Old S-rank Notes
Achnatherum nelsonii ssp. dorei Columbia Needlegrass S3 SNR Added to tracking list
Polygala senega Seneca Snakeroot S4 S3S4 Previously removed from tracking list in 2014
Osmorhiza depauperata Blunt-fruited Sweet-cicely S4 S3S4 Previously removed from tracking list in 2014
Antennaria howellii ssp. canadensis Canada Pussytoes S4 SNR Not tracked
Antennaria howellii ssp. neodioica Tomentose Pussytoes S4 S2 Removed from tracking list
Myriophyllum verticillatum Whorled Water-milfoil S4 S3 Removed from tracking list
Amelanchier sanguinea Round-leaved Serviceberry S1 none Newly added to the Sask. flora list and tracking list


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