References

For Galeopsis

Harley et al. 2004. In Kadereit, J.W. 2004. The families and genera of vascular plants. VII. Flowering plants – Dicotyledons – Lamiales (except Acanthaceae including Avicenniaceae). Springer, Berlin. 478 pp. Google Scholar

Stace, C. 2021. New flora of the British Isles, fourth edition, October 2021 reprinting with corrections. C & M Floristics, Suffolk, U.K. 1266 pp. Google Scholar