Watercress

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A perennial aquatic plant that contains glycosides, minerals, vitamins A, C, E, niacin, and volatile oils; it is diuretic, expectorant
Indications Internally, coughs and bronchitis, diabetes, weakness; topically, a poultice for gout, rheumatic disease
Warning Watercress may be a vector for liver flukes, and must be cleaned
References in periodicals archive ?
Roedd dail y berwr dwer (Rorippa nasturtium-aquaticum; water-cress) hefyd yn boblogaidd yn y gwanwyn fel tonig, ac os blaswch chi'r rhain, mae'n ddigon hawdd gweld pam - mae blas cryf, siarp arnyn nhw.
The poisonous ones to avoid include hemlock, fool's parsley, various water dropworts, and fool's water-cress.