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- 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
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