St. Johnswort species, Hypericum quadrangulare (unresolved name). Handcoloured copperplate engraving by F. Guimpel from Dr. Friedrich Gottlob Hayne's Medical Botany, Berlin, 1822. Hayne (1763-1832) was a German botanist, apothecary and professor of pharmaceutical botany at Berlin University.

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Size: 4603px × 5897px
Photo credit: © Florilegius / Alamy / Afripics
License: Licensed
Model Released: No

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