Radical 214 meaning "flute" is the only one of the 214 Kangxi radicals that is composed of 17 strokes, making it the radical that requires the most strokes.
In the Kangxi Dictionary there are 21 characters (out of 40,000) to be found under this radical.
Fazzioli, Edoardo (1987). Chinese calligraphy : from pictograph to ideogram : the history of 214 essential Chinese/Japanese characters. calligraphy by Rebecca Hon Ko. New York: Abbeville Press. ISBN0-89659-774-1.
Leyi Li: “Tracing the Roots of Chinese Characters: 500 Cases”. Beijing 1993, ISBN978-7-5619-0204-2
