Akeroyd, J.R., 2014
Docks and Knotweeds of the British Isles (ed 2)
The second edition is 25% larger than the first and includes more detailed coverage of subspecies and hybrids. The latter now follow one of the parent species rather than being listed at the end.
After a brief introduction, the identification section starts with a brief review of the characters used. This is followed by the dichotomous Key to Genera, then the individual Genus entries, beginning with a short confirmatory description, then maybe a key to sections, followed by key(s) to species and subsprecies.
The major portion of the book consists of detailed species accounts facing line-drawings of the whole plant or a stem, fruiting perianth, fruit, ochrae, perianth, etc.
||Botanical Society of Britain and Ireland (BSBI) (BSBI)
||All native and established species and hybrids, plus a number of casual adventives.
||Line drawings facing the species descriptions.
||With x8 or x10 hand lens.
||Fresh or pressed material, ideally with upper and lower leaves and mature fruits.
||Generally straightforward, but hybrids more challenging.
||A new edition is in preparation