It is used in Keizuko, that has one less scent than Genjiko, and expressed by linking the heads of the longitudinal lines that seem to be the same scents with horizontal lines, which rule is similar to the Genjiko.
源氏香より香数の1つ少ない系図香に利用され、源氏香の図と同様に、同香と思ったものの頭をつなぐことで完成する。