1. Editorial Committee of the Administration Bureau of Chinese Plant Medicine, ‘Chinese Flora’, Science Press, Beijing, 1979, Vol. 65, p. 594.
2. National Council for the Conservation of Plants and Gardens, Phlomis Distribution by Country, http://www.nccpg.com/gloucestershire/country.html.
3. Phlorigidosides A–C, iridoid glucosides from Phlomis rigida