Polygonum humifusum C. Merck ex K. Koch ssp. caurianum (B.L. Rob.) Costea & Tardif
Annotated by Patrick Williston, Jim Pojar, 2010.

British Columbia: Atlin Lake, Telegraph Cove. Elev. 674 m
Collected from the warm, shallow waters of Telegraph Cove where it grew with Isoetes echinospora, Ranunculus flammula, Potentilla palustris, Deschampsia caespitosa, Callitriche palustris, Hippuris vulgaris, Equisetum arvense, Carex aquatilis, and Carex saxatilis. A 4-5 m band of low gradient lakeshore in this cove supports diverse plant life that are protected from strong wave action by the local topography. Very large aquatic snails observed at this site.

Patrick Williston 7372, 2010 Jul 16
UBC, Accession: V235432