Corydalis cava - holewort
From the large genus of Corydalis the native in Finland are only fumewort (C. solida) and C. intermedia. Holewort is a delicate species from the Central Europe and it has reddish-purple or occasionally white flowers. The major difference to the native fumewort can be found underground. Fumeworts are tuberous plants and tuber of holewort is hollow (cava = hollow, concave).