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Seeds of Violet spread by ants, seed has an oily gland at one end which ants find attractive, I presume as food.
... Viola labradorica hort., which is not the true Viola labradorica, but instead a form of Viola riviniana (V. r. Purpurea Group).
With the inconsistent colouring in this one, it may be stretching the scope to include it in Purpurea Group.
Lat/Lng: 51.5, -0.1
OS grid ref: TQ3384