The word "紫藤" is formed by combining the character "紫", meaning purple, which is a pictophonetic character with the silk radical "糸" indicating color and "此" providing phonetic cue, with the character "藤", meaning vine, also a pictophonetic character with the plant radical "艹" indicating plant type and "滕" providing phonetic cue; together they create a compound word that literally means "purple vine" to specifically refer to the wisteria plant.