Four figures showing pericarp and seeds in fruits of an apple and a milkweed plant (Asclepias syriaca). Coloured etching by F. Sansom, c. 1802, after S. Edwards.

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Four figures showing pericarp and seeds in fruits of an apple and a milkweed plant (Asclepias syriaca). Coloured etching by F. Sansom, c. 1802, after S. Edwards. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.