Links to Saskatchewan wildflower websites:
Flora of Saskatchewan Association.
Native Plant Society of Saskatchewan.
Species Lists, Saskatchewan Conservation Data Centre.
Links to other wildflower websites:
E-Flora BC: Electronic Atlas of the Plants of British Columbia ...contains quite a few plants found in Saskatchewan. Very good species descriptions, and has multiple photographs for each plant.
Other links relevant for Saskatchewan wildflowers:
George F. Ledingham Herbarium, University of Regina
Integrated Taxonomic Information System
Nature Conservancy of Canada, Saskatchewan branch
W.P. Fraser Herbarium, University of Saskatchewan