Hudson, John H. “Pigmy-Weed (Crassula Aquatica (L.) Shoeni.) and Spurrey Knotweed (Polygonum Spergulariaeforme Meisn.) New to Saskatcewan, and Comments on Five Other Rarities Found 1998-1999”. Blue Jay 58, no. 3 (September 1, 2000). Accessed May 5, 2024. https://bluejayjournal.ca/index.php/bluejay/article/view/5949.