The Voynich Botanical Plants

Folio 42r. Wood sorrel and sorrel (Oxalis acetosella and Rumex acetosa). As their generic names indicate, both plants taste sour due to the presence of oxalic acid. In the past, an oxalate, sal acetosella was extracted from wood sorrel by boiling. The leaves of both plants should be eaten sparingly to avoid forming calcium oxalate stones in the kidneys. (B)