Where relevant, the following information from other species accounts are given.
1. Links to BSBI detailed species accounts, e.g. http://sppaccounts.bsbi.org.uk/content/astragalus-danicus-0
2. Published accounts are given for Rare and Scare species covered by:
British Red Data Books. 1. Vascular Plants. 3rd edition. M.J. Wigginton (Ed.). 1999. Pp. 468. JNCC.
Scarce Plants in Britain. A. Stewart, D.A. Pearman & C.D. Preston (Eds). 1994. Pp. 315. JNCC, Peterborough.