Field Guide to Noxious and Other Selected Weeds of British Columbia
Lady's-Thumb
(Polygonum persicaria)
branched annual with stems growing erect or spreading from 0.2
to 1 metre long; lance-shaped leaves with black blotch in centre
and a thin papery sheath with long hairs at the base; flowers are
pink in a small spike-like cluster
green smartweed (Polygonum scabrum) is similar but with
green flowers and glandular dots on the undersurface of upper
leaves
