Leaves and twigs of lilac (Syringa), box (Buxus) and alder (Alnus). Watercolour, pencil and pen drawings.

Licence: Public Domain Mark

Credit: Leaves and twigs of lilac (Syringa), box (Buxus) and alder (Alnus). Watercolour, pencil and pen drawings. Wellcome Collection. Source: Wellcome Collection.