《北史·列传·卷七》
翼的弟弟树，字秀和，又字君立，姿容秀美，擅长吐纳之术，兼有将才武略。
翼弟树，字秀和，一家独立。美姿貌，善吐纳，兼有将略。
Yi's younger brother Shu, courtesy name Xiuhe, and also courtesy name Junli, was beautiful in appearance and skilled in the technique of breathing exercises, and he also had talent as a military strategist.