damson -
The color of the fruit of this tree, a very deep purple.
Wikipedia
The damson or damson plum (Prunus domestica subsp. insititia, or sometimes Prunus insititia) is an edible drupaceous fruit, a subspecies of the plum tree. Sometimes called the Damask plum, damsons are commonly used in the preparation of jams and jellies.
OmegaWiki Dictionary
Ω
damson The small, dark-blue or purple fruit of a plum, Prunus insititia.
