Persicaria

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Persicaria

plant genus in the Polygonaceae family; contains an unidentified hepatotoxin which causes hepatitis and photosensitive dermatitis; includes P. hydropiper (willow weed), P. lapathifolia, P. maculosa (P. vulgaris), P. orientalis. Called also smart weeds.
References in periodicals archive ?
Persicaria affinis can be a fabulous addition to the late summer garden, with its short spikes of pink flowers, never reaching more that 250mm (10in) high and forming a useful carpet of foliage that turn red-bronze in autumn.
You can also look out for varieties of Persicaria campanulata and P.