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

[London] : [publisher not identified], [1863-1880] ([London] 18 Hatton Gdn. : F. Waller imp.)

1 print : lithograph, with watercolour

1. Polygonum minus - small persicaria 2. Polygonum dumetorum - copse buckwheat W. G. Smith del et lith. Lettering includes numbers for the two plants depicted

Wellcome Collection 24490i