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The genus Calystegia, until recently widely accepted, has been shown to be genetically embedded within Convolvulus,[6] and is now treated as a synonym of it by the Plants of the World Online database.[5]
They are annual or perennialherbaceousvines; a few species are woody shrubs. They grow to heights of 0.3–4m scrambling through ground vegetation, shrubs and trees; the shrubby species (e.g. C. cneorum) growing to 0.5m tall with a woody base. The leaves are spirally arranged, and the flowers trumpet-shaped, mostly white or pink, but blue, violet, purple, or yellow in some species.[7]
↑Thorogood, Chris (2016). Field guide to the wild flowers of the western Mediterranean. Richmond (Va.): Kew publishing Royal botanic gardens. pp.412–414. ISBN978-1-84246-616-2.