Rehmannia angulata (Oliv.)Hemsl. Scrophulariaceae Chinese foxglove. Distribution: China. Named for Joseph Rehmann ((1753-1831) German physician (Stearn, 1994) who emigrated to St Petersburg and became the personal physician to Tsar Nicholas 1. Rehmannia glutinosa is used in Traditional Chinese Medicine for arthritis. Photographed in the Medicinal Garden of the Royal College of Physicians, London.

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Rehmannia angulata (Oliv.)Hemsl. Scrophulariaceae Chinese foxglove. Distribution: China. Named for Joseph Rehmann ((1753-1831) German physician (Stearn, 1994) who emigrated to St Petersburg and became the personal physician to Tsar Nicholas 1. Rehmannia glutinosa is used in Traditional Chinese Medicine for arthritis. Photographed in the Medicinal Garden of the Royal College of Physicians, London. Dr Henry Oakeley. Attribution 4.0 International (CC BY 4.0). Source: Wellcome Collection.