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Five flowering plants, including bistort (Polygonum bistorta) and knotgrass (Polygonum aviculare). Chromolithograph by W. Dickes & co., c. 1855.

Five flowering plants, including water pepper (Polygonum hydropiper) and redleg (Polygonum persicaria). Chromolithograph by W. Dickes & co., c. 1855.

Redleg plant (Polygonum persicaria): flowering stem. Chromolithograph, c. 1877, after F. E. Hulme.

Water pepper plant (Polygonum hydropiper) and two square segments of a gel-like substance. Watercolour.

A plant, possibly a knotweed (Polygonum species): flowering stem and leaves. Watercolour.

Six British wild flowers, including water pepper and knotweed (Polygonum species). Coloured lithograph, c. 1846, after H. Humphreys.

A plant (Polygonum orientale): flowering stem. Coloured engraving, c. 1792.

Two plants, one possibly a knotweed (Polygonum species). Watercolour.

A ground-cover plant (Polygonum vacciniifolium): flowering stem. Coloured zincograph by C. Rosenberg, c. 1850, after himself.

Two species of knotweed (Polygonum species): flowering stems. Coloured lithograph by W. G. Smith, c. 1863, after himself.

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Polygonum

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Redleg plant (Polygonum persicaria): flowering stem. Chromolithograph, c. 1877, after F. E. Hulme.

A plant (Polygonum orientale): flowering stem. Coloured engraving, c. 1792.

Two species of knotweed (Polygonum species): flowering stems. Coloured lithograph by W. G. Smith, c. 1863, after himself.

A ground-cover plant (Polygonum vacciniifolium): flowering stem. Coloured zincograph by C. Rosenberg, c. 1850, after himself.

Six British wild flowers, including water pepper and knotweed (Polygonum species). Coloured lithograph, c. 1846, after H. Humphreys.