The term 'deep, reddish purple' can be described by two crossword solutions: petunia (7 letters) and PUCE (4 letters). Petunia is a genus of flowering plants in the family Solanaceae, commonly known as nightshades. The flowers are usually white, pink, or purple, and have a distinctive frilly shape. PUCE is a dark reddish-purple color, similar to burgundy. It is derived from the French word for flea, which is thought to refer to the color of a flea's body.