《魏书·列传·卷四十三》
只有稷坛所种树种没有现成根据，但它是社的分支，大概也不会离了松树。 
惟稷无成证，乃社之细，盖亦不离松也。 
Only the trees planted in the Altar to the God of Grain do not have a ready-made basis, but it is a branch of the Altar to the Soil, so it probably would not be different from pine trees.