Polygonaceae (knotweed or smartweed family of plants)
some prefer nettles; there's no accounting for taste; every man to his taste
dyer's knotweed (Persicaria tinctoria, used to produce indigo dye)
water pepper (Persicaria hydropiper)
water pepper (Persicaria hydropiper f. purpurascens)
kiss-me-over-the-garden-gate (Persicaria orientalis); prince's feather
dyer's knotweed (Persicaria tinctoria, used to produce indigo dye)
water pepper (Persicaria hydropiper f. aquaticum)
water pepper (Persicaria hydropiper)