In "Sengaikyo" (oldest topography of China), the tree top the birds were perching on was `fusang' (pictorial motifs), and the tree was the `god tree', and the upper branch is where the ninth sun is to perch while the lower branch was for the first sun which was about to come out, which identified an inconsistency between them.
『山海経』には鳥の止まるこずえは「扶桑」と、木は「神樹」として登場するが、下の枝は9の太陽が留まるところとされ上の枝は1つの太陽が今まさに出んとするものであるとあり、若干のズレがある。