《梦溪笔谈·杂志二》
我出使契丹，到了契丹人从前居住的地界，见到大蓟茇就像车盖一般大，在中原没有这么大的。
余使虏，至古契丹界，大蓟茇如车盖。中国无此大者。
When I was on a diplomatic mission to the Khitan, I arrived at the place where the Khitan people used to live and saw large Artemisia lavandulaefolia like carriage hoods. They are not so large in the Central Plains.