The word "海棠花" is formed through the sequential combination of three characters: "海" (hǎi), which means "sea" and in this context historically contributes to naming a plant; "棠" (táng), which denotes a type of tree, specifically the crabapple; and "花" (huā), meaning "flower". Together, they create a compound noun where "海棠" serves as the base term for the crabapple tree, and the addition of "花" specifies the blossom, resulting in a direct reference to the flower of the Chinese flowering crabapple.