Article from Bean's Trees and Shrubs Hardy in the British Isles
Recommended citation 'Convolvulus' from the website Trees and Shrubs Online (treesandshrubsonline.org/articles/convolvulus/). Accessed 2025-03-26.
In addition to the more familiar soft-stemmed species, Convolvulus contains a fair number of more or less woody plants, natives of the drier parts of S. Europe and W. Asia, with a few in the New World. Of these only the species described is widely cultivated.