A perennial plant that is usually blue and erect, with oval petals. It is commonly found in the temperate regions of Europe.
Nicholson, George The Illustrated Dictionary of Gardening, Div. VI (London, England: L. Upcott Gill, 1884)
913×2400, 442.3 KiB
389×1024, 56.0 KiB
243×640, 26.2 KiB
121×320, 9.1 KiB